I have a 2000 Ford Taurus with the FFV engine. I have been having problems for a while when the car is at idle speed. At times it will idle low 400-600 rpms and knock off. At other times, I can crank it up, and it idles fine (600-800 rpm). I read another post suggesting the IAC valve may need to be replaced. I looked up how to locate/remove it in an aftermarket repair manual, and it suggested testing the voltage coming into the valve from the PCM. The manual stated that I should expect 10.5 - 12V with the ignition on. I measured about 2V. The manual does not go into other steps to perform if the voltage is low. Does this mean I have a bad PCM, or are there other steps I should take to rule out other problems?
Thanks, JJ