When the temperature is warm out it really makes it worse. I'll be driving and my coolant temp will hit 205 degrees and the engine just shuts off. Will restart at times. Yesterday it did it and took about 3 or 4 tries to get going again. Always happens when doing a lot of stop and go driving. Any ideas to the cause? I think I am running a little lean so could that attribute to the problem?

 

if your coolant is at the right level and it;s 205, it shouldn't shut off till like 260F, If it does.

Probably just the tune.