Just wondering, when a car is idle the throttle plate is closed, so how is air getting into the engine? My intake manifold doesnt have a IACV either.

 

No IACV? which engine?

 

My intake doesn't have IAC either - the throttle body does. The IAC motor controls the amount of bypassed (idle) air.

If there's no IAC, I would suspect you have a DBW car, in which case the ECU sets the throttle angle for target idle speed (no IAC)

If it's not DBW and there is no IAC, there must be a mechanical adjustment screw or throttle stop of some type (like a carburetor)

Engines don't run without air so it has to be getting in there somehow.

 

You should have an idle air adjustment screw on your TB.

 

I do, but how do i know where it needs to be?

 

Your car should idle around 750 when completely warmed up.