Do what I said... You could have been done by now. If you had bad coil packs or ICM youd get a code for it. So the easiest thing to do would be to pull the plugs and visibly check them. And if you dont know when theyve been replaced last, just replace them with new one's. Its not a difficult or expensive procedure.
Or
Lets be basic... Do you know if/when your plugs have ever been replaced?

 

okay ive been quoted quite a bit for ik20 plugs, are nkg 7 the same?

 

You want NGK BKR6E or BKR7E. Im pretty sure youd get the BKR7E if your not chipped, and the BKR6E is for chipped or BT. Ive forgotten exactly, do a search.