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GARY

GARY 7/9/2012

2003 GMC Envoy SLE 6 Cyl 4.20L

Engine

VERY LITTLE POWER DURING ACCELERATION

142,000 MILES-LOSS OF POWER DURING ACCELERATION. CODE PO172/CHANGED O2 CENSOR, MAP, ACCELERATOR CENSOR, FUEL FILTER, SPARK PLUGS & WIRES, ECT CHECKED FUEL PRESSURE 60PSI. WHEN WE REPLACED THE ETC CODE 172 WENT AWAY AND NOW PO300. STILL DOING THE SAME THING. LEANING TOWARDS THROTTLE BODY POSITION CENSOR THROTTLE ONLY OPENS 29% WHEN YOU STICK A SCREW DRIVER IN THE BUTTERFLY IT ACTS AS IF IT WANTS TO ACCELERATE

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