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this is what's going on , i don't know if its normal but or if something might be wrong . i have a 2001 5.3 and that every time i start it ,it starts and idles as if it has a cam , then 5- 10 seconds later it will smooth out . is this normal with a tune ? i have a nelson tune . oh and this is with the engine hot or cold . your feed back will be vey helpful.
So it just idles rough? And did it start before or after the tune.
after the tune .
I would just email Allen about it.
i give them a call tommorow. they might know whats wrong of the back
Yeah. Allen will take care of you.
Check the fuel pressure regulator for a leak from the vacuum port. Also check for cold intake vacuum leaks. Both cause this complaint and are common.
mine does the same...
Mine does the same thing sometimes. I was told it's either the fuel pump, regulator or fuel injectors. I don't know how true that is, but I am already having problems with my fuel guage being accurate, so I am replacing the whole thing including the pump. If that doesn't take care of it I will move on to the next piece of the puzzel. My truck has 80,000 on her, so it can't hurt..... I don't want to remove the tank twice.