'93 E-Series that had an intermittent stall/no start, no communication, & fuel pump would run constantly KOEO. PCM had some bad capacitors
Did broken exhaust manifold bolts on a '08 E-Series, I have had real good luck using PM-2(Motorcraft Spray Carb Tune-Up Cleaner). I spray it on the broken studs and come back a little while later and the studs just seem to spin right out. When I get the stud out it looks like the PM-2 has worked it way up the threads.