shift solenoid. had to have mine replaced last winter because it was doing exactly what your both describing. it would shift perfectly until temp got to half then it would start slipping into second. don't let it go like that for too long though. and it was a PITA for the GM tech to do so not sure about doing it yourself.
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[ion] C2 - I ran her hard, on nothing but the bare ground. After easing into it and progressively pushing down harder I could feel the pressure building and once it peaked I let off and she gave a loud cry from the blow off valve.
Ttop191 - ^ because your car is the only thing that will suck and blow that you can actually successfully get within 25 feet of
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