e30

SteveAZ on e90post was right, the STFT is maxed when it stumbles and it goes super rich on throttle release under partial throttle. Proper solution is most likely to reset the adaptives using INPA.

at low throttle car simply "stumbles" where I all of a sudden have no power and the car starts to slow down then it comes right back. This all started after I added an inline LPFP, which it ran fine with for a week, then I added some E85 I had laying around in a gas can which had sat for about a month. I suspect its bad gas because the fuel pressures stay just fine.

did a 3rd gear pull while car is stumbling at times just to see how it looks.