I have a 98 2.2 boosted cavalier. Tuned with an AFC neo/fuel pressure regulator and other. i have been able to drive the car for the last 2 years fine. would run prefect after coming out of open loop mode. AEM wideband would be around 14.1-14.3 when cruising in 5th gear at 3000 rpms. not beating on it just driving. now I parked the car for about a week. now when the vehicle comes out of loop. and i drive it runs fine. 14 ish a/f , but as soon as i hit 2500 rpm it just floods the car with gas my 02 goes straight to 10, leave off the gas go below 2500 and it goes right back to 14. i was wondering if it might hvae something to do with my stock o2 sensor because i know it needed replaced before. if anyone can give me some insite i would greatly thank you.

chris

wait..you're running 14.1-14.3 AFR under boost?? How much Boost are you running?