Question about 1993 GMC Sierra
You probably bumped your dist to one way of the other. advance will cause a ping. also check the placement of the plug wires to make sure your not off by one.
Posted on Nov 13, 2010
Testimonial: "thanks but wires are on properly,never touched anything else.could the EGR valve be MY PROBLEM. "
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Posted on Jan 02, 2017
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