Alrighty guys I swear I have the answer. My buddies 86 out of no were did the exact same thing as yours. Its started running really rich and bogging. we started to replace everything and were getting no codes regarding the problem, we had no luck in solving the problem. so we took it to a place called Jobrite up here in Canada that works on mostly fords. It took them a few hours but after looking over the whole wiring system they came across one blown fusible link and the the internals of the distributor were shot. so they sold him and used distributor and fixed the fusible link and WALA it runs amazing now. Just go over all your wiring and specifically check you fusible links and for sure the distributor pickup, which is inside the distributor.