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I have a 2007 Chevy Avalanche with high mileage. This reduced engine power issue started to occur about 6 months ago. The issue would seem to take place in spurts. It wouldn't occur for a few weeks and then it would happen several times over a few day period. My wife wouldn't drive the vehicle so I became very adept at removing the battery cable waiting a few seconds and then reattaching. This would always correct the issue for a while but became very annoying as it would seem to happen at the most inconvenient times.
The issue started when the vehicle had about 175,000 miles on it and at 197,000 miles I decided to order the direct replacement throttle body from Rockauto. I didn't decide to change the throttle body until I read all of the comments listed here. It seemed to be the most logical fix for the 2007 model year as compared to many who have had the wireharness type of causes. The throttle body cost me $167 including a new gasket (which you won't need) and shipping. The replacement is very easy and took me 30 minutes to do myself. I'm writing this now after almost a full month of no issues. Since my vehicle has high mileage, the replacement of the throttle body which was relatively dirty has improved the responsiveness of the vehicle. So far so good... If anything changes I'll post another note.
FINALLY FIXED, "SERVICE STABILITRAK & TRACTION CONTROL DIAGNOSTIC PROBLEM:
"SERVICE TRACTION CONTROL",
"HARD SHIFT 1-2 GEARS"-(STABILITRAK TURNING OFF-CLUNK NOISE)
DRAINED & CLEANED GAS TANK-
CHANGED FUEL FILTERS (*ONLY IF NEEDED)
FILLED GAS TANK WITH NO ETHANOL- (http://pure-gas.org/index.jsp)
(STABILITRAK CLUNK NOISE): http://chevroletforum.com/forum/silverado-fullsize-pick-ups-21/2010-silverado-stabilitrak-question-47580/
(GAS STATIONS WITHOUT ETHANOL): http://pure-gas.org/index.jsp
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