So after taking my car to the track last night it is defanatley running slow, i cant figure it out problem goes as follows.....If my car has been sitting for a long period of tim like overnight or 5-6 hours it runs awesome does not hesitate at all and acclerates like it should but after driving for about 10-15 minutes it starts to run really crappy , idling rougher hesitating when acclerating and just not feel as fast as it should???? HELP!!!

 

check o2 sensors or coolant temp sensor both will screw with ya bad

 

Check the normal things first. Like:Plugs/wires, cap and rotar, air filter, and especially the fuel filter I had a clogged one, and it really made me slow, hestitate, and stumble during acceleration, and backfire.

Sounds like this is something that only happens when it gets hot... Lol it could be alot. You could have got some water in your tank. Put some of that Heet stuff from walmart in the tank it will get rid of anything in there, and if there isnt anything its still ok to use. Dirty of clogged fuel injectors, tranny fluid level incorrect causing slippage. EGR not functioning correctly vaccuum leaks at intake manifold.