I have a r33 gtst ( auto ) and it’s stock apart from a front mount intercooler, carback exhaust and pod filter.
It runs fine up until 6psi but once it goes over 6psi the car cuts out and jolts foward ect . Can’t figure out if it’s a boost cut or fuel cut or why it’s happening.
Currently running 7psi with a manual boost tee
Any ideas what it could be? Have checked the afm and it seems fine, vacuum lines are fine and can’t find any boost leaks ( it holds boost as long as it’s less than 6psi )
im thinking it might be coilpacks, spark plugs or tps but don’t really want to start buying parts until I know what I need so I don’t replace stuff that isn’t broken