When a vehicle does not go into gear when it is shifted from park to drive, it is usually due to transmission issues. If it has a manual transmission the gears may be stripped, if it is automatic then the transmission may have overheated.
Your air suspension is bleeding off.
A Ford Escort might not idle properly if the throttle position sensor is not functioning properly. This part is a plug in that is on the side of the carburetor (throttle body).
Hitting parked cars?
Does yours have air suspension on it. You may have a leak causing it to sit lower when you are not running. Ford Expeditions with air suspension is designed to lower when parked for easier access.
bought used engine and had it installed for less than 1000 a few thousand dollards...
"Where is the crankshaft position sensor on a 96 ford probe SE?"
where is the throttle position sensor located on the 06 ford fusion
Faulty brakes or your belt might have fallen into the wrong position on the barrings.
Check out the related link for a video on how to replace a crankshaft position on a Ford Focus SE.
It's on the throttle body of the Ford Aspire.
It appears that the Ford Aerostar with 3.0 engine does not have a crank position sensor, but the 4.0 engine does have one.
My ford truck key fits and starts my taurus! But that might be because the switch is worn, but you might want to try a couple different ford keys before tearing off the steering column. there were answers for hard way also, here is one way that might work although it doesnt sound very easy to me: http://www.ford-forums.com/ford-taurus/4345-how-replace-ignition-switch.html