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1994 gmc 2500 w 454or 7.4

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Old 07-17-2010, 03:12 PM
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Default 1994 gmc 2500 w 454or 7.4

starts ok, runks ok, but ob\nce it gets hots, starts, missing and backfiring. replaced spark plugs with NGK 2177 plugs, set card with vacuum gugae at 20 inches, set time to specs, any suggestions, though maybe coile was breaking down when hot
 
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