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Old 01-20-2013, 04:49 PM   #1
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Bucking issue. Please help

I have no idea what this issue is. The car has been sitting for 3 or so years andirons have brought it back to life. I have changed the spark plugs and wires. It goes great till I want to cruise and when I just barely push on the gas to remain at speed it starts to buck. Or jerk. It is very unpleasant and I need to figure this out. I am new to mustangs but not mechanics. And suggestion would help alot
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Old 01-20-2013, 06:07 PM   #2
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I can almost guarantee you that it is your TFI module on your distributor. About a $40 or less fix and easy to do. Go to local aftermarket parts store. Simple fix. Had this issue on my 91GT and had no clue. Changed the module and problem solved
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Old 01-20-2013, 07:38 PM   #3
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+1 on the tfi module but also could be distributor cap. If it has a hairline crack anywhere it could also cause the bucking. I would check that first as its alot cheaper than tfi module.
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Old 01-20-2013, 08:02 PM   #4
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What cam does it have in it and is it a 5 speed ?
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Old 01-20-2013, 08:10 PM   #5
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+1 finchms. Very well cld be distributor cap and or rotor. I had no clue and changed the TFI module. Had no issues after that. Anyways, good luck and be sure to post what u find. Thanks!
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Old 01-21-2013, 09:59 AM   #6
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If its only doing it under light acceleration or cruising I would suspect your fuel filter being the main problem. You'd be surprised what havoc 3 years of sitting can do to a fuel system.
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Old 01-21-2013, 10:16 AM   #7
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+1 93 slow stang
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Old 01-21-2013, 12:03 PM   #8
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+1 93 slow stang
+10473
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Old 01-21-2013, 01:29 PM   #9
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I changed the fuel filter already that was one o the first things I did. I changed the tfi and still no luck
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Old 01-21-2013, 05:38 PM   #10
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Wow. I wld have swore that the tfi moduke was the culprit. I apologize. Only other thing i cld think of that u havent already done wld be the distributor rotor and cap. How old are the plugs and wires??? Possibility of that as well
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Old 01-21-2013, 06:57 PM   #11
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I changed the spark plugs and wires already as well
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Old 01-21-2013, 07:00 PM   #12
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I changed the spark plugs and wires already as well
U checked the cap for cracks or anything?
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Old 01-21-2013, 07:03 PM   #13
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I changed the spark plugs and wires already as well
If u have a big cam an a manual transmission it will buck at slow speeds and under light acceleration
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Old 01-23-2013, 02:21 PM   #14
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I don't know if it has a big cam in it or not. The idle is loopy for sure. Also the car has a scratch on it but that's it. Would that affect anything?
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Old 01-23-2013, 02:29 PM   #15
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I don't know if it has a big cam in it or not. The idle is loopy for sure. Also the car has a scratch on it but that's it. Would that affect anything?
If the gears aren't matched with a bigger cam it will cause the bucking. This can happen from just trying to take off easy and if u runnin low rpms in a high gear while trying to accelerate.
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Old 01-23-2013, 06:14 PM   #16
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Is there anyway I can figure outbid I have a bigger cam?

---------- Post added at 07:14 PM ---------- Previous post was at 07:12 PM ----------

Is there any way I can figure out if I have bigger cams or not?
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Old 01-23-2013, 06:19 PM   #17
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Just punch the throttle everywhere? Should stop the bucking.
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Old 01-25-2013, 10:28 AM   #18
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I don't want to punch it everywhere. I like to cruise. I have another car that I specifically built to punch it. Should I just do the distributor and cap nod If that doesn't work just leave it?
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Old 01-25-2013, 05:44 PM   #19
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Just punch the throttle everywhere? Should stop the bucking.
I laughed so hard
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Old 01-25-2013, 08:10 PM   #20
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I don't want to punch it everywhere. I like to cruise. I have another car that I specifically built to punch it. Should I just do the distributor and cap nod If that doesn't work just leave it?
I would try the cap n rotor as its fairly cheap n check your fuel pressure also.
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Old 01-26-2013, 06:45 PM   #21
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Okay. I'll try that. Thanks
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