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Old 07-13-2010, 09:43 PM   #2
ChevyTech
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Join Date: May 2004
Location: Minnesota
Posts: 4,620
Re: 1990 chevy code 42

Have you checked or adjusted the timing recently?

A code 42 will get set when the set timing connector is unplugged to set the timing.

Does the service engine light come on while driving?
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