I'm having a problem with the idle on my 95 SC, very low . When running in park the voltage reading between the two pins at the selenoid starts at 6 and slowly decays all the way down to less than 1. Is this normal? I think maybe the PCM is not fuctioning properply and allowing the volts to drop, therby not opening the IAC to maintain the correct idle RPM. The IAC selenoid checks out ok, no short and the ohms are within the spec. Question should the PCM be replaced?