Trying to diagnose a no spark condition, it's a '93 F-150 4.9 I6, 240,000 miles. I did all of the electrical diagnosis tests; ICM (on fender well), coil, plug wires, distributor (rotating) pip sensor, fuel pumps go on, relays under hood are good. It seems that the last thing it would be is the computer. Unfortunately there isn't any known test that I know of. I know they are pretty uncommon to go, but the truck does have a lot of miles. I just want to be sure before pulling the trigger ($$$) on buying one. Anyone have any experience with this?