sputtering when flooring it

[Garageaholic]

My M30 engine sputters (like backfires) when i give it gas when accelerating hard. Is this normal?

I have 19# injectors in it, but havent installed my dinan chip yet


Why is my engine sputtering on acceleration?

[Garageaholic]

Is it too much fuel?

Or is the timing off ??

[Sean]

Sounds like too much fuel to me - is your O2 good?

[Garageaholic]

I don't think it's the 02 sensor...

Could it be that i put bigger injectors in it? maybe causing flooding and misfires.. bc it doesn't happen on full throttle.... ONLY WHEN CRUISING OR EASILY ACCELERATING

[nando]

I doubt it's the bigger injectors. I've run bigger injectors for years and never experienced any negative side effects.

could it be a bad AFM?

[Garageaholic]

How can i troubleshoot it... any trix?

[Garageaholic]

I had an exhaust leak at the headers... After putting new exhaust gaskets between the headers and the downpipes, i had no gurgling sound on deceleration and no backfiring anymore. Sounds great now!