The other day I took my boosted d series to a shop to setup some aggressive 2 step, after 10 minutes of banging away I drove the car away on my way home and noticed it was running its usual 13 afr under extremely light throttle but as soon as I press any more it goes as high as 16 and I'm not talking about stepping on it I mean 40% throttle I found the next day that the manifold had multiple cracks so i promptly replaced it and its spooling better but still leans out the same even breaks up when I try to floor it I had injectors clean and everything I cant think of what it could be I'm about to get a retune but cant think of how 2 step would throw off my tune, my tune doesnt read off the o2 sensor I just have it to have an idea of what's going on with my car any help would be greatly appreciated car was running perfect before I got the 2 step set up
Wiseco pistons
Eagle rods
1000cc injectors
E85
320lph fuel pump
60 trim Garrett
15psi
Wiseco pistons
Eagle rods
1000cc injectors
E85
320lph fuel pump
60 trim Garrett
15psi