Posted by George Marsh on November 18, 2013 at 14:26:54 from (64.12.116.16):
In Reply to: Re: 4.3L GMC posted by CDN on November 18, 2013 at 08:34:50:
CDN, I think you nailed my problem. Looking closely at things, I discovered not only rust on rotor screws, but under rotor was a white dust. The same dust on the spark plug wires, road dust. Cleaned off dust, put grease on distributor to make a seal, replaced cap and rotor, which Auto Zone replaced for free. Truck runs just fine. I also purchased new wires, however I wanted to know for sure what my problem was so I didn't install them yet.
I even looked at my old delco cap and rotor. They don't look bad. Thinking the cap needs a gasket to keep moisture out. Once again, I'm betting it's a GM design flaw. Post back if problem returns on the next humid day. Hope not.
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