the co sensor wont have a cap, and tbh adjusting it makes little differecne but can make you get more fuel, i had mine adjusted when at power engineering, didnt notice any difference but he said it would, but who knows lol.

if all sensors seem to work, fuel systems ok, ecu is fine, basicly your saying everything apart from the engine it self is ok, so now you have to look at the fact that something within the head could be naffed.

my rs ran like shit for a while once, i went through everything, then finaly came to the fact that something in the head must be to blaim.

it was, this



on the left is a good tappet, on the right, one that got eaten by the cam, thanks to this the swarf fucked the big end below and i had to rebuild the engine, the cam was scrap to as it wore the cam out