Having computer issues - misfiring, rough idle, then it stops and all is fine.

What is your question?

A recall was issued to deal with the PCM software, which I had updated. Fine for a couple of weeks, then same thing. At the time, OBDII codes issued were P0172 and P0175, fuel banks 1 and 2 running too rich (respectively.) When it doesn't "self correct" after a few miles, I pull over, turn off the engine, wait 30 seconds and restart. Usually (95%) works fine after this, from 2 days to 6 weeks. Van was perfect up until 60,000 miles, I now have 70,000. Anyone have a cure for that? Thanks for your help.