Also to help diagnose... upon start up. Assuming the only problem was the TB and everything was functioning. Prior to relearn procedure and right after installing. Would it even go into limp mode... or just not be "correct" idle and air fuel.. if anyone actually knows the answer this will help diagnose.
If no relearn was done on the tb then both actually, iirc it will go into limp mode after due to the tb not being synced and creating improper readings which will cause or should cause an unstable idle... it's been a while since I dealt with tb issues as I do relearns as needed.