well its not ticking badly like some engines do. i agree some engines just tick a little, and honda with high mileage... they just tick a tad. I've heard a lot about the sea-foam thing, a buddy of mine is a massive civic freak and built his own car and swears by the stuff. I just get nervous becuase I dont like pouring stuff into my engine when I dont know much about it or what it can do. I looked it up online and saw really good and really bad things about it. The oil leak stopped completely, I think it was the valve cover gasket.

The engine never really "overheated" exactly. It never got to the top of the red mark, just about 3/4ths of the guage so thats why im saying i doubt there was much damage to the engine itself. Its just that, the idiot that had the car (My Boss), never changed the flippin oil in at least 10,000 miles and thats terrible. The inside of the valve cover was caked with carbon shit. If you guys agree with seafoam as a good idea then ill go for it.

As for the idle, somehow it got better. It was idling at well over 2grand, but after the valve cover cleaning and gasket change, and spraying engine degreaser all over the throttle body exterior its much better..... Dont ask me how thats possible, im guessing sticky throttle plate? hell if i know.

By the way, it has a brand new 02 Sensor and that was a BITCH to get out. Damn thing was seized in the exhaust manifold. There were some codes stored in the computer from the past but im not sure why. Code 12- Egr Lift Malfunction, Code 17- Vehicle Speed Sensor, Code 41- O2 Sensor Heater, and Code 41- Fuel Supply System.
I had the check engine light come on several times after the o2 sensor change but i dont know if its still saying bad 02 or related to one of those other issues. I need to pull the codes again. Any idea what "Fuel Supply System Malfunction" could mean?

Anyway, any suggestions on how to get the most out of an engine thats got 150+k miles on it would be great.