The door locks on my vehicle are acting up. Every time I come to a complete stop and start up again the door locks click on and off.

What year is this vehicle? I'm assuming this is when your using the remote. If door locks click back to unlocked it is commonly an issue with one of the door latch switches not reading the door/trunk as closed. Depending on the age of your vehicle it possibly could be the driver's door as that is the most used door latch.

remove rear panel and check latch for damage or linkage disconnect --also check electrical connections to other components

Climb in vehicle close door press and hold central lock button on console. Doors lock and unlock. Release lock button press and hold button on key for a few seconds doors should lock

Hi Cindy, I'm glad to help! Here's something you can try, it works on most vehicles. While the alarm is sounding, turn the key in the drivers door several times and see if it stops. If it doesn't and you have a lock cylinder in the liftgate, turn the key several times in the liftgate lock and see if it stops. If it doesn't, try the key in the passenger lock cylinder if it has one. If this doesn't work try disconnecting the negative battery cable for 20 seconds then reconnect it. If the alarm is still sounding then try the doors again, if it still doesn't stop then you'll need to take it to the repair shop. Hope this helps and have an awesome day Cindy!

Yes it's likely the fuel pump. If that was the first time the filter was changed and it really needed it, it usually causes the pump to fail. It's in the gas tank.

from outside the car make sure all doors a closed completely, make sure hood and trunk are also closed. lock the vehicle with the remote, unlock it and repeat, lock and unlock. if it still wont start, put the key in the driver door lock, lock and unlock the door three times with the key, then try to start.

the first suspect is the igniton switch. when this happens, take the ign key and just barlely turn it, either way, not enough to go off/on just a little tweak, it the lights come back on or flicker, that ign switch will need replacement.

Yes, there is a way to reprogram your car to lock the doors when the gear selector is put into Drive.
Follow this site for a complete step by step re-program of the door locks:
http://www.nialtima.com/automatic_door_locks-113.html

I locked the 2000 lincoln continental with the key fob but lost it now the ignition key wilolo not unlock the door

you can try switching the key to the "on" position then open the hood and disconnect the negative terminal of the battery and reconnect after 2minutes. this will allow the alarm to be '"reset" and will recognize that you have the key for the vehicle.