so, car bucks and hesistates at wot, as soon as it begins building boost. if I pull at part throttle things go more or less smooth, but as soon as I go WOT, it kinda misfires, bangs from exhaust and won't accelerate.

changed spark plugs to used but known good ones, also switched to COP setup and it helped a lot, but still does same thing at 14-16 psi

spark blowout/gap ? bad MAF ? boost leak ? tune? fuel starvation ? (have hardwired walbro).
which way to look for problem

 

change plugs and gap at .022

 

Ya... get new plugs first for sure and go from there.

 

do you have a wideband?

 

ive been having the same problem with my car ever since it got cold out.. made 740ish on my 3586 in the summer.. ran great.. got cold out and breaks up HORRIBLE.. only on warm days it runs great..

 

lyke omg change sparks plugs

 

I do have wideband but haven't managed to hook it up yet, so no idea about afrs
will try and change plugs first

 

when did you install the wally? have you checked your fuel pressure?

 

was on the car when bought + hardwired and no, I haven't checked the fuel pressure

can it be a fault for the symptoms above ?

 

What fuel are you using, my friend?