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Home >> GMC >> 1989 >> Forward Control 3.9 L, Standard >> Repair and Diagnosis >> Engine Performance >> System >> CCC Tests W/O Codes >> Surges &/Or CHUGGLE >> Symptom Definition
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Symptom Definition

Engine power variation under steady throttle or cruise condition. Feels like vehicle speeds up and slows down without changing accelerator pedal position.