suggestions on sputtering

[talontedtsi1995]

I have a fwd 2g with a t-28 turbo, intake, 3-inch exhaust.. The car would sputter and get fuel cut all the time at WOT, so i upgraded the fuel pump to a walbro 255 lph and it deff. did help the car stop sputtering but sometime at WOT it will slighty sputter and cut out.. what should my next step be on solving the problem? thanks

 

[Quasimondo]

Fuel cut has nothing to do with your fuel system.

Chances are that you have a leak somewhere in your intake between the compressor outlet and the intake manifold. This leak is causing your turbo to work harder than normal to maintain boost. The MAS sees a turbo that spins harder than normal as lots of airflow. When the signal the ecu sees from the mas is high enough, that will trigger your fuel cut.

Check for leaks along your intake path.

 

[BISHILVR]

I agree with Quasi. Also how much boost are you running? If you are running higher boost (and even if your not) you should check your plug condition and gap, this has been known to cause sputtering when the gap is open too far.

 

[talontedtsi1995]

boost controller is turned all the way down so around 11-12 psi, i looked for leaks, did not find any, spark plugs are okay also, but, i have the factory boost controller still connected electrical wise because when i would unplug it, it ran worse and check engine light would come on, also, i have the manuel boost controllet hooked up the the vaccum line coming out from the turbo housing and the wastegate, any ideas if anything could be set-up wrong? thanks for the help..