[Larry Hills]

Some Fords have a in-line starter solenoid. Sometimes they will stick closed (the started keeps running). The soleniod is turned on when you turn the key to the start position and turned off when you let the key go back to the on position. The soleniod had three wires on it: One from the batt., one to the starter and one from the ignition sw.
Get a remote start switch. Disconnect the wire that runs from the solenoid to the ign. sw. Hookup the remote start sw. Turn on the ign sw & try the remote start sw. If the starter doesn't stop when you release the remote start sw, you have a bad solenoid.
If it does take a look at the wiring, you may have short.