I have a 97 GP GTP and I am getting a code 1811 max adapt and long ****. If the car is still cold it shifts good, but when the car is warm it will shift perfect from 1-3 then going into overdrive it will disengauge and the rpm gauge will jump up about 200 rpm or so then it will drop like its going to lock up but then it will hunt, I can watch the gauge search around then I can feel the car lock up eventually. If I crack throttle a bit as its dropping rpm it will lock up perfect and drive fine. All I read is Pressure Control Solenoid replacement, but I havent read many people having the problem as it shifts into overdrive and its heat dependant. Any ideas
