If this is the ford V-10 the problem is a fuel control module . one way to start the vehicle is to turn the key on 4 times ,not so starter turns ,and it will usally start on the 5th full turn. when starter engages .the problem is a bad fuel control module, FCM located midway down the frame on the drivers side frame on some RVS, has bad connection, not grounded properly or is loose. This module ia about size of a deck of cards. This is a notorious ford problem. The fuel control module is located on ford pickups right above the spare tire. Has same problems. costs about $114. at autozone. I had to show the ford mechanic where to find it.
