Thanks for the info. I've always used the original key, so no issues
there. I've used the truck every day since this weirdness happened,
works fine - no stalling or Theft light issues. I'm inclined to think
it was unrelated and coincidence (perhaps some bad gasoline), I'll
probably defer taking to the shop unless it happens again.

Thanks,

Mark

"Fester via CarKB.com" wrote:
> When I first got my explorer, I used the wrong key in the lock, you know, the
> one without the chip in it. The car wouldn't start, and I subsequently had
> the same problem. When I finally took it in, the diagnostics revealed that
> the theft system had detected a theft attempt and therefore began disabling
> the car. They reset the system, and I haven't had a problem since then.
> Only cost me fifty dollars and saved a lot of stress. As I said in the other
> post about this, the diagnostics had also revelaed an issue with the
> oxygenator, so it could have been either one.
>
>