I apoligise if this has been covered, but i've done plenty of searching and can't find alot or matching circumstances to mine.
recently purchased a 32 gtst and I've noticed when warmed up and everytime i pull up it idle hunts very low (down to around 400rpm) and sometimes even stalls.
i've been told it's running rich, there is a lot of black build up inside and around the exhaust and it occasionaly pops on gear changes.
mods are:
-r34 turbo
-3inch turbo back exhaust
-nismo 555cc injectors
-z32 afm
-walbro fuel pump
-blitz return flow cooler (dent from tow bar, been told it still holds pressure fine)
-hks pod with CAI
-aftermarket cams
currently running on stock boost.
The car has had a tune done by Dr drift by the previous owner.
I don't have a whole lot of knowledge about forced induction as this is my first turbo car but i have a suspicion that the car was running higher boost before being sold as all these supporting mods seem fairly pointless at stock 5-7psi boost. If the car WAS running higher boost than stock and was tuned for the higher boost level with these mods, would this explain the car running very rich and almost stalling from getting too much fuel?
any help would be appreciated, thanks.