Question about 1998 GMC Sierra

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Engine will start and rough idle but dies when either the brakes are applied or the lights are turned on!

Was driving along and the truck died instantly, but still had dash lights. thought it might be fuel pump at first, but after letting the truck cool a bit, it started and idled rough then I noticed when trying to limp it home everytime I applied the brakes or turn on the headlights, it would die. tried disconnecting the battery to clear codes, but no luck same problem. Starts everytime but idle's rough ( low RPM'S less than 500) any suggestions?

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  • lewinsk Sep 03, 2008

    It will die whether I'm idling or cruising, same thing happens it's seems like a ground fault somewhere.

  • mark schleck May 11, 2010

    does it die on you when you are accellerating or cruising? or just at idling.thanks from schleck.

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1 Answer

Have you checked out your fuel filter? I had my 2003 denali do the same type of problem and it turned out to be a very dirty fuel filter.

Posted on Sep 06, 2008

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