Jerry, The idle speed thermistor in the internal water pipe. 750 is a little low also. John Hervey www.special T auto.com << Hello List Have a problem, need advise. My car starts on first try , runs for a few seconds and goes to low idle before it is warm enough to run, it tries to idle at 750 rpm but dies. I can restart it afew times, when it is warm enough it will keep running. What tells it to stay at high idle until it is warm enough to run? >>