Question about 1999 Chevrolet Tahoe

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Downshift hesitation? i have a 2000 tahoe (old body style) 5.7 liter. truck seem s to run fine until i go to downshift (pass or sudden acceleration) it will severely hesitate, to the point where it actually will lose MPH! It seems to backfire(can't really tell). if i let off the pedal a bit, and very gradually ease into the pedal, it will regain speed. As a result i dont even bother to pass anymore especially when i LOSE mph in trying to do so? i have replaced plugs,wires,cap,rotor and fuel filter. truck has 118,000 miles on it. any and all help or suggestions would be greatly appreciated. Thanks!!!

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Sounds like a plugged catalytic converter or in rare cases muffler. This will set codes but try this; remove O2 sensor closest to front of catalytic converter, it will be noisy but drive again, if performance is better, suspect plugged catalytic converter,replace cat and reinstall O2. Also check air filter and mas air flow sensor. Have had some luck carefully cleaning sensor with throttle body/air intake cleaner after removing from vehicle with key off. Hope this helps ! Rate me please.

Posted on Jan 18, 2009

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