My Envoy revs real high before changing speeds and has low power. on 2002 GMC Envoy

water pump went out and I changed it the other night.. the check engine light stays on but the worst is now the motor revs real high before shifting and sounds like needs to shift again yet low power .. I check the fluid it has enough.. for about 2 seconds the low power light came on but not anymore.. and man is it sucking gas.. any ideas?/

by in Ankeny, IA on January 29, 2014
3 answers 2 comments
ANSWER by on January 29, 2014
Have a scan test performed, possible trans slipping.
COMMENT by on January 29, 2014
Thanks Pushrod.. I'm going to do that..
COMMENT by on January 29, 2014
You bet.
ANSWER by on January 30, 2014
get a free diag and est from aamco then post findings
ANSWER by on June 26, 2014
the throttle body is bad.its electronically controlled by a gear case within the throttle body where the wiring plug connects.the gears are stripped causing the throttle body not to check this remove the air chamber mounted on top of the intake connected to the throttle body to expose the throttle body flapper that controlls air intake.turn the key on but do not start the engine.leave the wiring harness connected.with the key on press the accellerator and observe the flapper.if it does not open this will comfirm that the electronically controlled gear is malfunctioning.....replace the throttle body.ifound a used one for 100 one is around 250 dollars.

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