most prob air leakage as well... mine had a bad string of leaks.. only found that out on a dyno at ASG.

my leak was coming from my silicone intake as well as the cracked silicone hose on my fmic.

make sure the part of the silicone intake connecting to the bov return hose is properly connected. best is to have a metal stopper there and set bov to fully atmospheric (if u have a aftermarket one).

Lil' cracks on intake hoses = hell loads of dramas, my advice is to get it on a dyno to diagnose the problem so as to avoid running the car crappy and fiddling what's wrong and what's not