I have a b18b1 boosted with a 18g greddy kit. The car started miss firing so i changed the plugs to NGK BKR7E gapped at .30. It ran fine for about 5 miles and started throwing Codes (miss firing in 1,3,4) (Why do think it's not doing it in 2?).
I checked the plugs and they are white as hell. What should i do nexT?

 

your ringlands are gone, any extra smoke? smoking outta the valve cover?

 

yeah there was alittle this morning. I changed the plugs and i still have the codes. Should i do a compression test? I check the coil and it'
s good, Wires cap and rotor are new.