hi guys, im from the states and i need of a bit of help with my r33. ive checked the turbo, its good in working order, i just changed plugs and checked gaps for each. the car runs super rich about 9-10 a/f at low throttle just cruising, however at WOT the car leans out as it builds boost and jerks violently. also if i hold the throttle about half way it will build about 3 or 4 pounds and feels as if im brake boosting, suction from the intake/turbo is loud but no acceleration without the jerking. but as soon as i punch it it knocks and flips out. i changed plugs again and no help also checked vacuum sources and double tripple checked everything. im at a loss. there are no check engine lights. 127km on the car and motor. also car reacts the same way with the boost controller on or off.
mods include:
pod filter
front mount
turbo back exhaust
greddy profec boost controller at .6 bar
afc neo with decel at 1% throttle, 1.2 at 1000 and 3.8 at 2000. no tune.
thank you all for your help.