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Originally Posted by borninabarn
This vehicle acts like it is starving for fuel in small serges for the first minute or so after start-up. It then comes out of it and runs like a top. I have to wait approximately 1 hour and then restart the vehicle and drive it and again it will act up for around 1 min. I have had a fuel pressure guage taped to the windshield and it doesn't fluxuate at all. There are no misfires or codes and I seem to always have good spark and fuel pressure. This has been going on for about 1 year and getting worse all the time. I wish something would fail so I could replace it.Hope you techs out there have promising answer for this one. thanks born
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Since you have a fuel pressure gauge, watch the pressure AFTER you turn off the engine. It should drop a little but it should hold pressure. If it drops to near zero, you could have a bad fuel pressure regulator (my guess this is your problem) or a injector that is leaking.
//2000CAYukon