My passenger door won't lock. And when I'm driving it acts locks and unlocks

sounds like there is an issue with the door lock actuator,have that ck'd

It sounds as if internal door lock motor seems to be binding. Agreed have that inspected.

You need to replace the actuator on the passenger door. Or watch this tube on shot gunning. You can simply stick a toothpick in front of the lock. this is a temporary fix