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Old 01-02-2015, 09:44 AM   #7
speedygonzales
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Join Date: Jan 2006
Location: Smithfield, VA
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Re: 98 K1500 issues

If the same cylinder is misfiring, the plug should indicate it by being fouled. Or at least more fouled than the others.

You can then try swapping out the plug and the wire to see if that eliminates it. If those 2 things don't fix the misfire, you have no choice but to then change the cap. It couldn't be the rotor since that is common to all cylinders.
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