my engine has decided to go into a sort of 'limp mode'...
it idles quite rough (searches between 1000-1500rpm, sounds like a big lumpy cam..) and on a cold start it just feels like a rb20e, and wont boost much, however the guage is showing its hitting the usual 13psi.
the exhaust is also very loud and droney at the moment too.
normal driving, if you gently increase the revs, it goes to about 4000rpm then starts knocking (engine light flashes with PFC), and if you increase the revs too quick, it gets to positive pressure, then feels like it kills off all the power, and the exhaust just gets loud and droney again.
i have a stock AFM in it at the moment, but ive got a Z32 afm which i tried swapping it over to the other day, and that just seemed to make the problem worse, it was stuttering at low revs and i could barely get it back home from 200m up the road.
any idea's?