1998 GMC Sierra with 5.7 vortec. runs rough then stalls when stepping on accelerator. Have put on new fuel pump, new fuel pressure regulator, new fuel pump relay, new air filter. No leaks in fuel lines, truck starts and runs but loses pressure and stalls out still. Pressure about 62 then drops. please help
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62 is that a fuel pressure test?
did u check if voltage at pump was fluctuating?
what about fuel filter ?
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