hard to say for sure, could be anything. but, something electrical is not likeing the heat.

what happened to me was similar, when the car got hot, it started missing, backfiring, and running like crap. it finally stalled and wouldn't re-start.

after it all cooled down, the car started right up.


I replaced the coil because someone here said the coil was breaking down when it got hot.

problem never came back.