nano619er

Okay need help did icm delete coils n all, spark plugs, maf, still have p0300 multiple misfires also when under load boost will fluctuate from 10 to 20 psi sometimes cant get passed 10 psi like if something is holding me back! For misfiring heard could b pcv n check valve feels more like a o2 sensor to me I did install a 42 draft design test pipe maybe threw things off **** I'm lost do have CEL but that's for code p0300 so any suggestions? Would appreciate a reply thank u.