ha don I have had some experience in this area when I had my shop and taught auto emissions at the j.c. I know this will sound crazy but all fomoco service and tech manuals start with what ford calls a wiggle test ( honest I not making this up ) before you do any diagnostic testing bring the eng to opp. temp. and wiggle all the connectors you can find including the bulk head conn. at the fire wall and the ecm conn. that one do last because it's not easy to get to if the motor stumbles you have found the prob. clean the connector if that doesn't fix the problem we will go to step two good luck .....ted