i just did a b20vtec swap with a gsr head, i bought a skunk2 intake manifold with a idle air control valve on it and a ls throttle body and when the iacv is pluged up it idles at 2500rpm and when i unplug it, it fluctuates 1000-2000rpm, whats could be the problem? i tried to adjust the screw in the throttle body and clean the iacv, still notin

 

could be vacuum leak somewhere

 

hmm... did you change the throttle body gasket?

 

i dont think i did, my obd2 scanner reads the speed(rpm) fluctuation sensor is bad, could that be the problem?