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#1
06-02-2008, 07:52 AM
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Spark Plug Problem
I just changed out my spark plugs on my 87' GMC Jimmy. Once i started it up and noticed one cycle sounds like its mis firing alittle. It makes a little putt sounds every half a second. I gap them all at .045 which almost all GMC trucks are gapped at. I pulled out the old ones and they were gapped at .055. Once i heard the miss firing on one side of the engine. I pulled them all out and changed the new plugs to .055. i started the truck and still had the same problem.
What did i do wrong here??? 
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#3
06-02-2008, 06:04 PM
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Re: Spark Plug Problem
i bought all new wires and i know i didn't switch any of the wires, i might of over tighten one of the plugs, i'll buy a new one and change it out with everyone to see if i cracked one.
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