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bob 8/19/2012
2003 GMC Sierra 1500 SLE 8Cyl5.3L - Engine
Light comes on run fine then goes away
1 Answer
  • CVO
    CVO 8/19/2012
    What causes a cylinder to misfire? Basically, it's one of three things: loss of spark; the air/fuel mixture is too far out of balance to ignite; or loss of compression.
    1. A dirty, clogged or inoperative fuel injector, restricted fuel filter.
    2.A burned exhaust valve.

    Replace the fuel filter and add a 16 oz Chevron fuel injector cleaner to clean it.

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