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Discussion Starter · #1 · (Edited)
2005 Trailblazer 4.2
Shifts radically between 3rd - 4th at 1500-2000 RPMs.
Idle will sometimes jump to 1200 and down again for no apparent reason.
100,+ miles. Engine is not lacking power and I have cleaned injectors and replaced plugs.
Thoughts?

Thanks, love this forum.
:confused:
 

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Discussion Starter · #4 ·
Thanks for the help My TB did need cleaning. I still have the symptoms though.
When I first had the problem, I was convinced that it was the Overdrive. It is not!
I would downshift to stop the surges, now it will happen even in 3rd. If I am throttling gently between 1000 - 2000 RPM, I will get skipping or surges. Should I remove the manifold that the throttle body feeds into? I sprayed into it and wiped out what I could reach, don't know what it looks like in there.

Could this be a module as suggested by the parts store?:confused:
 
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