Here we go!
My wife has an '02 TB LT with the 4.2L I-6 Engine. It has 125,000 miles on it. We bought it new in February 2002. I have replaced the fan clutch 5 times since we bought it. Each would last about 1.5 years on average.
Over the past year and a half, it keeps getting the Reduced Engine Power light which in turn makes the SES light come on. It looses almost all of its power. If you pull to the side of the road and turn it off and then back on the REP light will clear and it will run fine. When it first started doing this it was very intermittent but now it is almost daily. I have had 4 aftermarket gas pedals installed. Each would last anywhere from 1 week to a month or so. The last time I replaced it with a GM pedal with the same results as the aftermarket brand.
I have replaced the throttlebody with a used one from a your pull-it yard. I cleaned it very well with throttlebody cleaner before installation. The issue was not seen for a week or two. I then replaced the PCM and had it reprogrammed. That worked for about a month!
I recently looked at the wiring harness to the throttlebody and even replaced the connector with a new one. I have not looked at the wiring harness for the fan clutch but will do that this weekend.
BTW, each time it goes into REP, it throws a P1271 code.
So, in summary I have replaced:
fan clutch = 5 times
gas pedal = 5 times
throttle body with a used one (but clean) = 1 time
PCM and had it reprogrammed = 1 time
connector on the throttlebody = 1 time
visually inspected the throttlebody wiring harness = 1 time
Does anyone have any other suggestions? I'm thinking a gallon of gas and a match! My wife is thinking a foot in my butt! Please help! Thanks!!