I've got a prelude si the timing is out i've changed the distributor and set the ignition timing but theirs still a slight misfire a loss of power I put a full kakimoto system on the car quite a while ago and the car was running fine it seems a lot louder than usual when i feel the car loosing power someone said it may be the oxygen sensor but i'm not sure or could it be the cat? I don't really want to take it to a main dealer as this will be very expensive.