Question about 2003 GMC Sierra
The problem may be located at the connector on the throttle body. The terminals can be loose, broken wires inside the the plastic where you cant see them, and corroded grounds.
If you can get the check engine light to shut off, try wiggling the wiring from the connector on the throttle body from the connector out to at least 4 inches to induce a check engine light. Clean and tighten the grounds on the engine block also.
Good luck finding the problem.
Posted on Dec 13, 2009
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Posted on Jan 02, 2017
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