system is too lean (Bank 1)

[boosteda418t]

ive been getting this code now for about 2 weeks now and i got the code before i put on the testpipe and o2 sensor. i thought putting the testpipe on would change this problem but i guess not. im running apr stage2+ and have bigger injectors as well. any suggstions?

[zims666]

try cleaning your MAF sensor

[mrbacardi35]

ive been getting this code now for about 2 weeks now and i got the code before i put on the testpipe and o2 sensor. i thought putting the testpipe on would change this problem but i guess not. im running apr stage2+ and have bigger injectors as well. any suggstions?

which injectors are you running? what year is the car?

[trueno429]

o2 sensor

[boosteda418t]

im running the apr (bosch) injectors from the tt225. i just put a new o2 sensor in so it cant be that. the car feels like its stuttering for a quick second on and off when i hit the gas but still has full power. im being told that it could be a vaccum leak by some ppl. could that be?