I have a 1993 Honda Del Sol S (d15b7 engine) and I just installed a new OBX throttle body spacer onto my car and it started making an iratic wandering idle. Between 1000-2100 RPM's, just a wide range of idling. I'm aware of the idling screw and ajusting nuts. IAC, TPS or anyone have any suggestions? Also it overheats, which I'm not sure if it is related. the Thermostat is fine...engine doesn't warm up unless I'm driving it, and the hose is hot, so it's not stuck open or closed. It evaporates the coolant also gets evaporated.

 

Warm the car up to operating temperature and bleed the coolant again. Leave the cap off the radiator while warming it up.