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Old 04-01-2007, 06:40 PM   #8
65-72 chevytoys
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Join Date: Dec 2006
Location: Wesley Chapel, Florida
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Re: update on the plugs...

From the Haynes manual.

Carbon Deposits = Dry sooty deposits indicate a rich mixture or weak ignition causing backfires, hard starting, and hesitation.

Recomendation = Make sure the plug has the correct heat range. Check for clogged air filter, problem in the fuel system, or engine management system. Also check for ignition system problems.
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