When I start from a stop is good until 1500 rpms, then wbo2 goes lean and hesitates, and its good after it gets to 2000. When I put it in open loop there's no hesitation and it drives smooth. I can hold it at 1700 rpm's in any gear and the wbo2 goes lean and nothing I do in VE helps. It drives great in open loop bc of the wideband tuning but the closed loop is so much more fuel efficient. L31, mild cam, no egr, 7427. What does the pcm do in open loop?