Dirty Intake manifold

[defwing]

I have a recently installed blacktop 180sx sr20det that has been fouling its spark plugs very quickly. It is also fouling the intake manifold, what could be causing it to foul?

[defwing]

Sorry maybe more info will be helpful,

Mods:
FMIC
atmo bov(but tightened up so doesnt open)
t28
EGR rerouted(doesnt feed into intake manifold)
walbro fuel pump

Boost gauge reads idle vacuum @ -.8bar. Pretty steady until it does idle surging which occasionaly does(because of fouled plugs?).
Fuel pressure seems to be ok @ 38psi, but im reading it with a oil pressure gauge lol.
Lately it seems to be stuck on high idle(2krpm) and timing on the powerfc shows 40degrees, although it used to sit at 17 with lower idle in past.
Knock sensor reading ultra high too but maybe coz of forged psitons??

Any help or ideas would be appreciated thanks. Thing that puzzles me is fouling of intake.

[yokotas13]

loosen the BOV so it lets air out...yuo kind of have to.
id imagine you just need a good tune due to the seasons changing