I had that problem too. We had alot of steady rain, and i believe the inground tanks got water in them. Filled up at $2.85 a gallon at Kroger. Ran fine until I went to start it later, and it sputtered and idled low. I ended up putting some Redline SI-1 fuel system cleaner in, and it cleared it right up. I recommend running some through it to clean things up. It has a high level if PEA in it, and imo, one of the best cleaners out there. My upstream o2 sensor ended up going out shortly after the bad gas's incident.
2000 TJ 4.7 ATK Stroker/32rh
3" BDS front coils, 2.5" OME HD rear coils, 33x10.50 KM2's, 15x8 Soft 8's, Skyjacker Hydros, RE Superflex arms, SYE/CV
2001 WJ Limited 4.7, lifted, locked, KM2's