Code 224...'92 Mustang 2.3

Hi, my name is Jan and I'm a 54 year old female who has been playing mechanic all of my life. I've got a '92 'Stang here with an intermitent ignition problem. It'll be running fine, then the tach will drop to zero and the motor will run roughly. Then often the tach starts working again and the miss goes away. So after attaching my code scanner in KOER mode, it threw two codes....998 (Hard Code) and 224 (IDM malfunction). I know that the IDM monitors the ignition input to the PCM, but haven't a clue where my problem lies. So far, the only thing I've tried is pulling the SPOUT, with dropped the tach to zero and made it run rough. This is the first DIS system I've worked on. Any and all suggestions as to where to check next would be greatly appreciated....

Thanks,

Jan

Thanks! I assume that Advance A/P can test these as they can a TFI module?

Will do. The guys there ALWAYS test everything I take in several times just to be sure.

Thanks,

Jan