Question about 1998 GMC Sierra

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1998 GMC Sierra- runs rough then stalls when

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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  • Jamie Stanley
    Jamie Stanley May 11, 2010

    62 is that a fuel pressure test?

  • carhob May 11, 2010

    did u check if voltage at pump was fluctuating?

  • duane wine May 11, 2010

    what about fuel filter ?

  • Anonymous Mar 12, 2014

    Where is the fuel pressure regulator located on 2002 gmc sierra v6

  • Anonymous Mar 14, 2014

    Gmc sierra stRtung and stalling out

  • Anonymous Mar 16, 2014

    Replaced fuel pump and oil pressure sensor truck will idle but will not run it stalls in gear and turns off

  • Anonymous Mar 17, 2014

    put new oil pump on gmc denali stil no oil pressure

  • Anonymous Mar 31, 2014

    no gas to engine



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Had this problem on my neighbors 98 chevy truck with the same engine !!
it turnd out too be the fuel pressure regulator,you have too pull the upper intake too replace it!!

Posted on Jun 06, 2009


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Possibly faulty ignition module is the problem, stalls when engine is hot when you sit for a while it cools off and runs again until it heats up again, those are usually the symptoms of a bad ignition module and after a while it may give out all together and not run at all, usually if the module is at fault it shuts down the fuel pump so the engine don't load up with fuel, do to when engine continuously cranks over the injectors never stop squirting fuel and flood the engine do to lack of spark which is produced by the module, this could possibly be your problem.

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Same thing here...

sounds like a restriction some where in your fuel system example dirt or anything that might get in your system check your filter and look for contamiation or possilbly a airation problem

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