My Z has started stalling any time after it has reached operating temperature. It starts right up after about 10-15 minutes most of the time. The last time it did this (about 2 yrs ago) it was the Crank posit. sensor. I am going to try that first. Also read about maybe it being vapor lock. Could the throttle body heater bypass influence vapor lock? I have done that mod. How do you trouble shoot that. My car has never had that problem yet. Also have the TCC disconnected for stalling when stopped.