sr hesitates at 4-5k rpm

[Dtoys S14]

I am having trouble with My s13 blktop det in my s14, when i stomp on the pedal the rpm goes up to 4k and starts to break up until 5 k and then clears up at 6k , i have no idea why am running 10lbs of boost walbro pump , hks front mount , 3'exhuast , but if i gradually go on the gas like if am driving on the highway it passes 4k , works like a dream , but if , lets say "drag race" it would just break up at 4-5k rpm , would my prressure regulator cause this prob , cuz one time i had to blow it out and the car worked fine now the ar is acting up again ! help please someone!!!!

help help helpDamian

[heavy1metal]

intake to the turbo have any holes after the MAF? Sounds like during ur boost is when you're having problems. I know i stutter when i gun it, but because the readings are off, more air than fuel. If anything try what works best, blow out ur pressure reg.

[goldollar]

Check your plugs. Gap them to 28 if they are not already, and make sure they are still good. I had a similiar problem when i upgraded to a 2871. Might be the problem might not but its a start. Let us now what happens.

[SpeedRacer1]

Clutch slipping?

[574-240sx]

check for leaks in the charge piping yet. How do the plugs look?