Working on an 03 Monty Sport, 3.0L, 2wd... just put then engine back in. Had it out to replace gaskets and rings. Got it back in and hooked up and after running for a bit and about 10 miles into the test drive, The check engine light comes on... got a code P0507 ...

I checked the IAC with a multimeter and got readings between pins 1 and 2 of 45 ohms... This is above the range of 28-33 that I've read. Can this cause the idle to be too high..?

 

yes......p0507.....Idle Air Control System RPM Higher Than Expected

 

it can also blow the ECU