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Tharon 8/22/2011
1986 GMC G3500 Magnavan 8 Cyl 6.2L - Engine
Loses power and back fires when giving it gas but not all the time.
Loses power and backfires sometimes when giving it gas. Sometimes runs ok.
milege is 28000 doesnt matter if warm or cold. no warning lights are on. recently had tune up and exhaust leak repaired and new fuel pump
1 Answer
  • Spoon Sports
    Spoon Sports 8/22/2011
    Misfires are caused by Incorrect ignition timing, faulty ignition or leaking valves.

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