Weird Miss

[slor33]

hey guys agan i couldn't find anything. since i brought my car its had a miss ot bad butits there and in the last few months its got worse, when i tak of from the lights is splutters and backfires and carries on and i don't know why. i've got new coils and i'm running nismo spec s plugs. i've also upgraded the power and earth battery cables. i've also got an safc and avcr. any ideas?

[(B1) MR_fanny]

have you had the safc tuned? get yourself some good old copper plugs and see how they go. im afraid to ask what you paid for your nismo spec s plugs