Originally Posted by
Romad
Let it idle for about 4 minutes and then gave it some gas. Smooth acceleration and everything was working beautiful. When temp got about 1/4 way up it started same ole hesitation and could not make it run at all.
BINGO!
Look at what you typed, you said the car runs fine to a certain temperature, then goes to hell. I do know that there is a temperature where the ECU changes from "open" to "closed" mode. It will take a lot of reading, but I know there is a transition that happens. It sounds to me that once the ECU goes to "closed mode" and the O2 sensors' input is important, the ECU has a hard time running the engine. This would imply that the readings from the O2 sensors are causing trouble. SO the question is, are the O2 sensors lying or are they seeing something about the O2 level (too high or too low) and is the ECU going too far trying to compensate for this?
I think you just posted the clue of all clues - too bad none of us have the expertise to explain what is going on.