Have a b20/wb16 head. I know someone knows the answer to this. Idle is crazy messed up. goes from 1k-3k.(when cold) (when warm sits at 1500) I have researched a lot and did trial and error. Not a vaccum leak, not the IAC, not a gasket leak....any help would be great.

 

Check FIT (Fast idle thermo valve), TPS (throttle position sensor) and MAP sensor.

 

Well check the connections.?, or check to see if they are working correctly, i used a map sensor, and tps from my buddys teg and it still have the same problem...Im not familair with the Fast Idle thermo valve where is that located on the TB.somewhere? thanks

 

FIT valve is under the throttle body with two coolant lines hooked up to it.

 

IS there a screw to adj there or...and if so tighten it or loosen it.? thanks

 

I don't think it's adjustable, you can only replace it if it fails. You shouldn't have air being sucked into the lower most hole on the inside of the throttle body when the engine is hot. If you do replace the FIT valve. Or you could go ghetto and cover the FIT intake in the TB with a piece of duct tape. Careful, it can get sucked in there, don't ask how I know.