Rough idle & shaking? - Mustang Evolution

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Old 04-02-2013, 09:49 AM   #1
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Rough idle & shaking?

Over about 50 MPH the car starts shaking and just rides very rough. And when the RPMs drop the car jerks like its trying to keep up with the speed. I don't know if bad spark plugs or wires could be causing this? Nothing has thrown a code yet though. 04 GT with 67K miles, I have changed the spark plugs but I used NGK indrium and I've heard people having problems with spark plugs other than oem. I would appreciate any help!
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Old 04-02-2013, 12:58 PM   #2
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Bump! Please help!
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Old 04-02-2013, 01:00 PM   #3
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After you changed you're plugs it started doing this? Or was it doing it before
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Old 04-02-2013, 01:17 PM   #4
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I can't really remember. It is increasingly more noticeable now though. It has a hard time acceralating also. Idk if one thing is causing this or multiple
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Old 04-02-2013, 01:17 PM   #5
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And you say it only happens over 50mph?
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Old 04-02-2013, 01:55 PM   #6
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Shakes over 50 but always rides rough no matter what speed rides rough
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Old 04-02-2013, 03:07 PM   #7
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Shakes over 50 but always rides rough no matter what speed rides rough
You probably shouldn't deviate from the oem plugs. I'm assuming that the firing order is correct. Might be a fuel delivery problem. Check the fuel pressure.
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Old 04-02-2013, 04:34 PM   #8
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So change the spark plugs back to oem? And how do I check the fuel pressure?
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Old 04-02-2013, 04:48 PM   #9
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So change the spark plugs back to oem? And how do I check the fuel pressure?
You might try that. It may or may not help. You're going to need a fuel pressure gauge. They have them at the auto parts store. You should get a repair manual for your car. It spells out the testing procedure and they are good to have around for troubleshooting problems. Its money well spent.
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Old 04-02-2013, 04:57 PM   #10
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Okay, I will try that. Seems to be maybe 2 different issues, where can I buy the oem plugs?
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Old 04-02-2013, 04:59 PM   #11
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Okay, I will try that. Seems to be maybe 2 different issues, where can I buy the oem plugs?
Auto parts store should have them.
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Old 04-02-2013, 05:08 PM   #12
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I may replace the plugs & the wires and hope for the best.
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Old 04-02-2013, 05:22 PM   #13
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I may replace the plugs & the wires and hope for the best.
Good place to start. Get the repair manual too!
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Old 04-02-2013, 05:29 PM   #14
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I will deff pick it up even though this forum always is a great place to get help. Thanks!!
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