i tuned few cars for my friends, all a/f in place, but shortly after few days of driving, the vehicle start to run very rich and idle real high, and lose power, almost like limp mode, but is letting it rev past 3500. can drive ok, but is like it getting out of tune on its own.

the map was creat by crome, becuz my chip burner(willem burn on offset 8000, untune map on 0000 but don't have a 2 timer on it so it wouldn't matter) not communicate with my lap top. so i use my laptop(crome pro) to tune and datalogging save it on flash drive then i pull up in crome free and do a few adjustment make sure everything correct and burn it on the desktop. unless crome free screw up the rom, which i doubt it, my car is tune and also in the same process but my car is fine, never have a problem. i don't realy know why the tune start changing and i don't know it really change or just the ecu is making different adjustment. o2 sensor is turn off. enable debug mode o2 checked, knock sensor disable checked, o2 heater and o2 sensor disable checked. thats about it and its on a p28. all chip set is solder right. only different between mine ecu and friends, i don't have the capacitor solder on 51?(can't remeber number, i at work)