Problems with door locks

[pat]

Hi all. I put power locks into my truck from A-1 Electric. With the doors open, both function correctly. With the passenger door shut, it locks/unlocks as it is supposed to. When I shut the driver door it wont lock the doors, and if it was locked, it will unlock them. I have found that when I shut the door and put some pressure on it, it will lock, but without this pressure, the doors wont lock. I messed around some trying to adjust the door striker plate, but that didnt help. Any ideas short of buying a new latch/calling A-1???