backfiring stumbling at idle after exhaust install

[liv4gnz]

so i got my catback put on, and it was driving fine and on the way home it started back firing, the car hasnt seen any boost yet, and if i sit at idle and hole the gas at like 1500 it revs up and down, headgaskets are new, everything is plugged in, im thinking its too much fuel? espescially since the puck is going right in the turbo housing until my downpipe comes in this week? any other thoughts?

 

[liv4gnz]

you can delete cam sensor was loose nd turned a little bit x:

 

[bk1987]

i had the same problem last week i also had that problem about 5 years ago both times i changed the MAF sensor and that fixed the problem also make sure your fuel pressure is correct when you put in a new MAF