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Re: Drop in gas mileage
You might want to have an exhaust back-pressure test done. GM has acknowledged that 01-02 GP may have been delivered with bad cats which can cause an exhaust restriction. Common symptoms are lack of power (especially under load or at high RPM), poor mileage, and random misfire codes. GM extended the converter warranty to 120k so you could be eligible for a free replacement.
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Still waiting for the "good old days" I'll get to bore my future grandchildren with!
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