Please help...I've searched all over the internet but cannot find an answer. Car runs fine when cold on up to about 30min of driving. Temp gauge shoots all the way to hot putting the car in limp mode, then the gauge will shoot back to normal. Sometimes it stays in limp mode and the gauge stays at hot up until I put I put the car in park, then it goes to normal and goes out of limp mode...I know about the block test yada yada and all of that, but that's not the issue. I had read about replacing the ECT sensor because it sounded like that could be the problem. I checked the harness to the ECT sensor and it's fine. So, I replaced the sensor and the car still does the same thing...please help...the engine codes aren't throwing anything that seems to coincide with the problem....could it be the PCM, or ECM. I need the issue fixed ASAP because I have to travel 80mi for work in 5days. Any advice or experience with this issue would be greatly appreciated.