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2005 chevy trailblazer_ls
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Hello,
Working on a 2002 Trailblazer 4.2L I6. Automatice awd 4x4

TPS Reading is reading at 21% idle and 35% at WOT, The vehicle is opening up the throttlebody only to a min probally.

I have plugged in 2 throttle body's with the same result. One from it and one a friend had laying around.

Could I have 2 possible bad TB's or is there some other issue.

The vehicle wont shift correctly, have to let off throttle or rev higher to get it to shift, but does not slip.

The issue started as not shifting correctly. I have eliminated some obvious codes and problems.
 

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You are not going to be able to test the WOT by sitting still and going Gonzo on the throttle. The computer won't let you open the throttle all the way unless the unit is rolling and you hit the throttle.

Even then, the computer will still modulate the throttle opening to make sure that the plenum vacuum stays at the value that is decided by the engineers at GM.

As far as shifting goes, you don't post enough info on that - but I bet that you've gotten a rebuild on this by now - no?

PS: I think your "automatice" is broken.
 
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