good mornin

ive been having this problem with 1997 type r sti, missfire at about 2500 - 3500rpms read a lot about it on here and other sites and came to the conclusion it could be the plugs, coil pack, maf, lambda sensor etc quite a big list lol. when i bought her it was overfilled with oil so could that have contaminated anything like a sensor? I have reset the ecu and still there. when i pulled the maf plug out wile running cuts out everytime. if i keep it at a steady 3 and accelarate slowly it misfires quite bad. once on full boost runs perfect.
any advice to narrow down my search would be greatly apricated

cheers guys
mike

 

my mate had the same sort of problem on his type r ,,,, turned out to be a loose plug lead,,check them

 

have you checked the gaps on your plugs??