Originally posted by GPGOVROOM:
sounds like pressure control selonoid, expensive fix for such a small part. Just my guess though I had the same problem after I purchased mine used, got it fixed under three month warrenty. good luck
I would guess the pressure control solenoid too. I might be having a similar issue.
What it does is send extra fluid into the torque converter into an area that makes the lockup clutch start locking up. There are actually several degrees of lockup, and it could be fumbling around and not locking or releasing all the way. Even worse, the clutch in the torque converter could be shot. I'm hoping mine isn't, but I can just disable lockup with my power tuner under certain speeds where I have this problem.
Oh yeah, I heard that the solenoid is actually a fairly easy fix and you can get to it by dropping the transmission pan. Not sure, though.