Question about 1990 Chevrolet Lumina
Did you just do the pump or the whole module.If you just did the pump the hose at the fuel pump may not be adeqautely secure this can result in low fuel pressure. Just for giggles remove the vacuum hose at the fuel pressure regulator and see if it make a difference if it does redo the fuel pump,secure the fuel pump with new clamps (not those plastic ones)
Posted on Feb 25, 2012
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Posted on Jan 02, 2017
Have you checked for vaccume leaks?
You've got lots of parts in there, Has the problem been the reason you have replaced all of those, or did it come up while doing some of the repairs?
Posted on Dec 18, 2009
SOURCE: Rough running and rough idle
Doesnt sound at all like an electrical control issue... more like a tune up...
How many miles? If its hard to start its typically due to spark plugs being worn down with age.. that engine has individual coils per cylinder so there are no "cap, rotor or wires" involved... just replace the plugs, they are platinum and they are about 8-9$$ each x8... but that is what you need
Posted on Nov 25, 2008
I had the same problem with my 96 Chevy 4.3. It idled rough enough to shake the truck at a stop. It revved up fine but sputtered on take off. My truck did not want to stay in overdrive because of the low rev. I changed cap, rotor, plugs, wires and this did nothing. Finally I took the intake off and found corrosion on the side intake gaskets near the rear of the engine causing a vacuum leak.
Posted on Nov 11, 2008
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