I have a 5th gen Prelude that is running very, very rich. I'm getting terrible gas milage fouling spark plugs on startup and dumping black smoke out the tailpipe...I replaced the O2 sensors about 10k miles ago and they are very expesive so i'm hoping that isn't the problem. Could a faulty fuel pressure regular be at blame, injectors....Honda told me something about a Cam Position Sensor...I didnt want to just start throwing parts at it, anyone got ideas? Thanks