2002 GTP 82k miles. It has a few mods listed below. Earlier in the year I had issues with the idle being very loopy to the point it would stall out. It only did it when it was raining, my dumbass cut a hole in the fender. I chalked it up to the filter getting wet. So I patched the fender hole.
Fast forward 3 months and hurricane Sandy rolls though. Go out to my car this morning start it up and ta-daa the problem is back. Driving today it threw a code for a bad o2. I cleared it and it hasn't come back. Idle is still loopy and stalling out. It'll do it for maybe 5 mins rev the engine up and it'll clear up and drive fine. Turn the engine off wait 5 mins and start it back up and your back to square one.
The o2 code today was the first check engine light in a while(10 months) or so.
What else could this be? No vacume leaks according to my gauge. Map sensor maybe?