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.

 

Was your car running fine before the install of this throttle body spacer? If yes, well, installer error seems to be the cause.

More than likely you've got a vaccum leak somewhere or air in your coolant system. Did you disconnect any coolant hoses during this installation? If yes, did you rebleed the coolant?