need help ASAP!!!!

[02_slp_ss]

well my car is being gay right now, i just put a 3in y pipe in it an a cutout, my check engine light came on said bank 1 to lean. talked to a couple guys at the GM grage an they said o2, put a new 1 in still does it wtf, but now the car misses like crazy acts like it loads up an wont go anywhere, but if i shut the car off an clear the codes an start it agine it runs fine, the code it gives for that is multiple cyl miss fire. its driving me nuts guys

[gnomee]

Make sure they sold you the right O/2.. Also really Double, Tripple check the wires and make sure something did not get melted.

Did you put a new Y pipe on stock manifolds or do you have headers installed?

[02_slp_ss]

i have LT on it i made a 2.5in y pipe just to get me by till i got money for the 3in. but with the old 1 i neverhad this problem. an i checked to make sure they werent close to my headers.. there not, i was thinking maybe im rear sensors behind my cat might be bad, idk just tring to think