The issue is on my 02 gt. I have a sputter, not all the time, at idle with no other problems in high rpms. Its throwing codes P0171 and P0174. I thought it might be water in gas because it happened right after a fill up. I put heet in it and drove around and its still doing, going to see if it changed anything tomorrow. It doesnt stall out just sputters between 500 and 1500 rpms only when in idle and park. I know it could be a MAF or O2 but i feel like it would run like shit all the time. Any help would be nice and if it fixes my car ill buy you a case of beer when I come home on the 1st. Car is also stock and have been running 87.