Thanks for the suggestions and info. The more I've thought about it, I'm also leaning towards the head wind (and possibly the smoky air, as well) since the car has run fine ever since.

As for Lean Burn, it would sure be nice to have some sort of indicator to know, conclusively, that one was in Lean Burn mode. With a simple indicator, it would probably be easier to develop some techniques to stay in that mode longer, too. One can wish.

Garrett
gar1138