Okay, I had this problem before, but it occured infrequently. It's happened twice in the last 5 days now. (I just installed my turbo setup this week). Anyways, the car will throw a check engine light sometimes, so I'll shut the car down and pull over, and try to pull the code, but the moment I restart the car, the check engine light disappears. Anyone have any idea what it could be. I think it might be the o2 sensor. I know on the dyno the wideband could barely read my a/f ratio. The car was running pig rich 10:1 or better, the bosch wideband could only read above 10:1.