Bucking During Hard Acceleration

[AllBoostNoJuice]

After my boost builds to about 19 psi my car starts bucking and backfiring. My O2 voltages are right around .92, and I have the NGK BR7es spark plugs gapped to .3. Can the stock coils handle that much boost or am I blowing out the spark?

 

[AllBoostNoJuice]

BTW, I have a SAFC-2, an Aeromotive AFPR, FIC 650 injecotrs, and a Walboro 250 HP fuel pump

 

[torbs]

idk if this is your problem or not, but in mine when i was wot at stock boost would do that and the balance shaft being way off was my problem...idk if thats what your thing is, just a possiblity...later

 

[Defiant]

Okay, it's not 3/10 of an inch.

 

[Bentcrank]

Fuel cut

 

[dwnshft99]

What is your fuel pressure?

 

[karbon]

I was blowing out the spark on mine when they were gapped at .03" so I regapped them to .027" and I'm not getting my spark blown out anymore.
Mine didn't buck though. Just kinda stuttered rapidly on acceleration.

 

[dwnshft99]

I was blowing out the spark on mine when they were gapped at .03" so I regapped them to .027" and I'm not getting my spark blown out anymore.
Mine didn't buck though. Just kinda stuttered rapidly on acceleration.

Thats what I think is the problem is. More of a missfire than fuel cut.

 

[torbs]

it turned out being the balance shaft that was WAY off...runs smooth now, but burning oil like a civ (1 quart every 300 miles or so )...gata get that rixed soon...other then that good to go