dooby-do

iTrader: (2)

hi people im in need of some help with my95 subaru,
i had the car built around 6-7 months ago and got it mapped by jgm and all
has been perfect until last week or so,i have noticed that the car has lost boost slightly not much maybe 0.2 bar or a little more also when i start the car up if i touch the throttle it will puff out black smoke and smell really badly of fuel even just ticking over it smells badly of fuel,i have also noticed that once the car is fully warmed up when i stop and pull away again it kind of stutters then pulls away, kind of like its bogging down.i have checked the plugs they seemed ok and checked all the coil packs and 1 was cracked so replaced it,and still the same,i have checked the vacum hoses ect and all seems ok so im kind of stuck to what it could be so any advise would be much appriciated a quick spec of the car is.
sti8 bottom end,v4 sti heads refreshed, ported and polished,cosworth multi layer gasket,arp head studs,inlet spacers,with raised inlet,new cambelt and tensioners ect,
owen delevopments gt3076r turbo
zen performance ppg 5 speed gearbox
helix clutch
sytech fuel pump
770cc injectors
simtek ecu
gt spec headers and uppipe
fmic

dooby-do

iTrader: (2)

Nobody ??

joz8968

iTrader: (13)

Sounds like coolant temp sensor is fubared(?)

But first check for obvious things like fuel line connections and boost control solenoid, turbo, w/g and vac lines, etc.