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Posted on Jan 02, 2017
Wow you have replaced a lot of stuff. Lets go back to the Fuel pump. When you replaced it did you replace the hose between the pump and the sending unit. These are common for splitting. Have you hooked up a fuel pressure gauge to check what pressure you have? It should be real close to 13 psi and should raise to at least 18 or 19 when you pinch off the return line.
Posted on Jun 02, 2009
SOURCE: 1995 gmc sierra 5.7 350. rough idle in gear when warmed up poor fuel miledge. changed vacum lines between throttle body and pvc,t-body and evap can. purge solenoid ,egr and map sensor.egr engine code
It sounds like you may have low compression in one or more cylinders, suggest you run a compression test, this should always be done when this condition exists and igintion is not source of problem. This engine also can have issues with intake manifold leaks, use a can of carburetor spray and spray around the intake gasket are to cylinder head, if a leak is present then the idle change when you hit the leak.
Posted on Dec 08, 2011
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