A starter will not disengage if the ignition switch is stuck or if the solenoid has jammed. This will cause the starter to constantly receive power.
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Absolutely not. The starter gear must fully disengage the flywheel gears when you release the starter. Otherwise when the engine starts the starter will continue to be turned by the engine.
Most commonly, it's the starter or the starter was wired wrong when it was installed. More rarely, it can also be the keyswitch or even a bad gear on the flex-plate.
When a starter is getting weak and starting to 'go out' you can often tap on it anywhere on the metal housing to get it to work. Eventually, it will fail so look for a new one.
I'd check two things: I don't remember what year Ford changed over, but if yours still has the starter solenoid on the fender, make sure you haven't crossed the small wires. If the solenoid is on the starter, are you certain that you've wired the starter right? There are a couple small wires that connect to the starter,if you connect them wrong it could the cause problems you describe. If you're CERTAIN that the starter and/or solenoid are connected properly, start looking seriously at the ignition switch.
Torque Converter Control Solenoid. It controls the lockup clutch in the torque converter, when it malfunctions the clutch can fail to engage or disengage properly causing shuddering at speed and stalling at idle. It is found inside the transmission as part of the valve body.