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Rough Idle 5.7 Vortec
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Question
flgator
Hello everyone, Im new to the forum. I have a 1996 GMC K1500 5.7 Vortec 180,000K. My problem is it has a rough idle and it is hard to start. I have to let the pump run 30 sec before I start it. Off idle and during acceleration it runs fine. When I drive the truck the engine light will go on and off. I scanned it and came up with P0300, P0172, P0175 ans P0141 codes.
Recently I changed plugs, new dist cap/rotor, wires, fuel filter, air filter and battery.
Checked fuel pressure: keyon/not running 62psi then drops to 20psi after 3 seconds. Truck runniing at idle 55psi and @1500rpm's 60 psi.
Checked for vaccum leaks and fuel leaks non found.
What should my next step be in diognosing this problem.
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