95GT jerking problem - Mustang Evolution

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Old 12-26-2013, 12:06 PM   #1
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95GT jerking problem

Still can't figure it out.I can't tell if it's tranny or spark plugs. Has anyone else had this problem?
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Old 12-26-2013, 12:33 PM   #2
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I'm not sure of the problem you speak of...what do u mean jerking? Is the car physically jarring you back and forth? Or do you mean idle is jumping around up and down? If its idle, it's prolly plugs, pull them and look for fouling, wires could cause that too, or timing. If its idling fine down the road, it's prolly mechanical, could be tranny which u should be able to determine, or could be tps sensor, throttle body sticking open or closed...need more info, but check the plugs first.

---------- Post added at 12:33 PM ---------- Previous post was at 12:31 PM ----------

Perhaps wires were crossed on distributor if they were replaced, that will cause rough idle issues too.
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Old 12-26-2013, 03:37 PM   #3
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The idle is fine but it jerks sometimes at around town speed and does kind of a surge in power on the freeway I'm using ngk plugs bkr5e but I think I need to go back to motorcraft. I don't know how to tell if the throttle body is sticking but I was thinking it might be that.
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Old 12-26-2013, 08:39 PM   #4
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I had the same problem in my 89 and it seams to be the tps or the Maf
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Old 12-26-2013, 08:46 PM   #5
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I've changed them both
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Old 12-26-2013, 08:50 PM   #6
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Did you gap the spark plugs right
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Old 12-26-2013, 08:58 PM   #7
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Did it do this before you changed plugs?could be plug wires,pcv valve or transmission

---------- Post added at 08:58 PM ---------- Previous post was at 08:57 PM ----------

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Did it do this before you changed plugs?could be plug wires,pcv valve or transmission

Also could be fuel filter or fuel problems
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Old 12-26-2013, 09:01 PM   #8
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Tranny rebuilt, wires and plugs new I'm going to switch back to motorcraft plugs tomorrow.
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Old 12-26-2013, 09:02 PM   #9
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When was fuel filter changed?
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Old 12-26-2013, 09:05 PM   #10
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I think it started after I put in new distributor.

---------- Post added at 08:05 PM ---------- Previous post was at 08:03 PM ----------

About a month ago. I'm losing my mind trying to figure it out.
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Old 12-26-2013, 09:07 PM   #11
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Might make sure the firing order is correct.sometimes little problems can be a headache
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Old 12-26-2013, 09:10 PM   #12
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Going to recheck that in the morning.
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Old 12-27-2013, 09:41 AM   #13
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Let us know on firing order, that's what I was talking about having ignition wires crossed. Other than that, pull your tb, ensure good manual operation of it off the car, just give it a good clean with throttle body cleaner. What's timing at?
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Old 12-27-2013, 11:13 AM   #14
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Firing order is correct. Timing at 10 degrees. Going to change plugs today gap at 54. Msd 6AL might be bad, but I don't know how to tell.
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Old 12-27-2013, 01:32 PM   #15
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Quote:
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Firing order is correct. Timing at 10 degrees. Going to change plugs today gap at 54. Msd 6AL might be bad, but I don't know how to tell.
It's your MSD distributor.
I reccomended going back to stock. I guarantee you that's the problem. I see it all the time.
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Old 12-27-2013, 02:28 PM   #16
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I have a stock distributor just have msd coil, cap and rotor and 6AL ignition box
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Old 12-27-2013, 11:37 PM   #17
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Does your car have a TFI module on the distributor? ? If so id almost say change it! Been there done that but mine is a 91 302. If yours had it, change it. Mine was doing what yours is and that solved it

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Old 12-28-2013, 04:55 PM   #18
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Yep. Change ur TFI module

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Old 12-29-2013, 01:13 PM   #19
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I've done me some research. I have a 91 GT. I know ur aggravation. Been there. Im not gonna swear on it but I think u need to look into ur TFI module. Motorcade is expensive but aftermarket modules are decently priced. My 91 did the same thing....changed the module and the jerking stopped. No issues in the last 3 yrs

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Old 12-29-2013, 02:03 PM   #20
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I bought a new module last night. I'm going to switch it out after football thanks for your help. I'll post the results.
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Old 12-29-2013, 02:53 PM   #21
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Good deal....be sure u put the special grease on the back of the module. It shld have came with a small packet of it. Do NOT put it on dry

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