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Unread 03-06-2009   #1 (permalink)
gburkett93 is offline Rookie


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Unhappy 1992 Mustang runs rough after warm up

Heres the deal before tune up car ran fine, after tuneup it acts like there is a miss after the car warms up it idle's fine, but when you take off it bucks and kicks give it more gas it goes then at normal speed say around 4th gear at 2,000 rpm you can watch the tach drop then come back up and you can feel the car slow down and go again. I replaced plugs, wires, cap, rotor button, coil, changed mass air it is all stock. Could it be the fuel filter, I did not replace it!!. Please help its driving me crazy. When i crank it in the morning it runs fine until car gets up to normal temp.
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Unread 03-06-2009   #2 (permalink)
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Pull the plugs back out to see if one of them may be bad or fouled, the bucking/lurching you described is usually indicative of a miss-fire in one or more cylinders.

Or, are you sure that you got the firing order right when you replaced the wires and the distributor cap?

If not one of these problems, it could be a defective or improperly installed coil.
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Unread 03-06-2009   #3 (permalink)
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It has to be related to what you did under the hood. If it was the fuel filter it would've done it before the tune up. It could be a crossed wire or a bad connection.
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Unread 03-07-2009   #4 (permalink)
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Wait until dark and pop the hood on your car and look for arcing from the spark plug wires. It sounds like you may have a loose connection or possibly a crack in the new dist cap from the factory or maybe one of the plugs has a cracked insulator.
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Unread 03-07-2009   #5 (permalink)
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my guess is you mixed up the wires when you put the new ones on, double check the firing order and remember the firing order for a 5.0 HO IS NOT the same as a regular 5.0
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Unread 03-07-2009   #6 (permalink)
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ok I checked everything all is good, the car funs good in the morning after it cools down overnight, but when it gets up to running temp, it starts running bad I replaced the Ignition Control Mod on Dist. it still does it COULD it be the pickup in the Dist. After the tune up it ran fine for about 1 week until it started this prob. do you think it could be the tps going bad
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Unread 10-09-2011   #7 (permalink)
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Did you get this fixed ? Pm me if you did and how as mine is doing the same thing
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