cant figure it out. Please help!!!! Thank you.

[carloscpu]

Well I have a 1998 Pontiac Grand Prix GTP supercharger. The problem i have is that the car runs fine for about 20 minutes and then becomes sluggish and turns off. I've changed the fuel pump thinking there was not enough pressure going into the engine but i still have the same problem. Can someone advice me. Much aprecciated in advance. And i have to wait for it to cool down and it will run again

[72mino]

You will need to determine what your losing, fuel or spark.
1. Is your check engine lite on?
2. When it stalls, if you turn the key off, then back to run do you hear the fuel pump run for a couple of seconds?
3. Have you tested fuel pressure while running/when it stalls?
4. Have you checked for spark when it won't start?
5. When it is sluggish does it still run smooth just lacking power, or is it running rough?

Dustin

[richtazz]

Welcome to AF

Any check engine light and if so, have you pulled the codes? Any backfiring, ABS/Trac off lights coming on? Let us know.

[carloscpu]

<P>there is no check engine light on. And it only starts when is on what can it be? how can check for a spark?</P>