Discuss 1992 Mustang runs rough after warm up on AllFordMustangs.com, the place for Mustang enthusiasts.
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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.
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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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.
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
1989 Ford Mustang LX Notchback,5.0L 5 speed
331 Stroker wuth forged eagle rotater, Scorpion roller rockers, mahle forged pistons, AFR185s,Spec Stage 2+ Clutch,Steeda Sub Frame Connectors with Seat supports,Hurst Short Throw Shifter, Mr. Gasket Hi0-Flo 180* T-Stat,Lunati VooDoo Series cam,Trickflow upper and lower intake,BBK CAI,BBK Long Tube Headers,BBK Off-Road H-Pipe,Flowmaster 40 Series Mufflers,Aluminum Driveshaft,17" Cobra R's,10000K HID's One problem after the next !!
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