Turn over problems

More info is needed to help solve your problem. The best place to put you car & mods is in your sig. What year stang, carb'd or EFI, what mods to the engine.
 
91 coupe, bbk short headers, bbk x pipe, cobra intake, no smog pump, cobra clutch. bbk short shifter. Please help. It also sounds like it is back fireing when it is first driven and very sluggish in power. It does that a coulpe of times and then runs good untill I drive in traffic for a bitt and everything goes bad and i start having those problems
 
welcome to the boards (there are a lot of new guys in here the last day or so).

are you saying that the car is dieseling when shut off? i have not known of injected cars to do that....weird.

first thing that comes to mind is that the timing is off. that is my wild guess off the cuff.
have you pulled codes?

im gonna stop here, cuz you got lucky: Jrichker is one of the smartest guys around, period. he has all the info (and more) that you should need, and he is great with troubleshooting.
good luck.