I'm having an intermittent problem with the CEL comes on when going down the highway. Engine code 2-3-1. I'm not sure how to diagnose this. It seems it could be an air leak, low fuel pressure, or the O2 sensor. It came on a few times about 8 months ago, then nothing, then about 5 times in the last month. The O2 sensor was replaced about 18 months ago. And the fuel filter was replaced about 4 months ago.

And now, the last two times it has thrown this code, I reset the ECU by pulling the 25amp fuse and go to start the car and it won't turn over. The first time this happened, i was driving down the highway, pulled off, reset and no start. As i contemplated calling a tow, i tried again after about 30 min and it started. So, i guessed it might have been flooded, which made sense in my head if it was in limp-home mode and running rich (I could be way off here).

however, it came on again last night and i decided to drive the 30 miles home and deal with it this morning. so, before starting the car, i went ahead and reset the ECU. and no start.

I have a mechanic who can look at it, but he's 80 miles away, and I'd love to drive the car to him rather than tow.

If anyone has any ideas about how to proceed, i'd appreciate it very much.
Thanks!
Shane