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Home >> Geo >> 1997 >> Tracker Base, 4D Utility, 4WD, Standard >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Automatic Transmission Diagnosis & Overhaul - 3L30 >> Trouble Shooting >> Symptom Diagnosis >> Upshifting Under Full Throttle Only

Upshifting Under Full Throttle Only

Check for faulty modulator, leaking modulator vacuum line, engine vacuum leak and/or stuck kick-down valve or cable.