whats up guys.

I have a twin turbo impalla ss with a forged 383 yadda yadda yadda.. very expensive build.

Tuned 2bar speed density and we have an issue with a 2000 rpm shudder / studder / surge. The ve is NAILED and the surge pretty much cuts fuel and leans out .

Things I have considered. Please let me know if you consider anything else..

Plug wires - one is loose or jacked ( new set btw)
plugs - cracked or fouled from early bad fueling in the tune ? ( new plugs same time)
vac leak?
egr - gone
emmissions - gone
optispark vent - he has it hanging loose.. says you cant put boost on it.. ????
air pump - gone!
optispark - brand new dynospark unit iirc?
Vacuum leak?
IAC?
one sticky injector ? 60# brand new motos

there is no maf


what else??

 

Im thinking it may be cam surge as well. Im going to put the car back into open loop and mess with the low rpm timing tables.