My 98 extended cab have problem with the small doors on the back. When I pull the handle they're unlocked but I can't open them. What should I do to remove them and check what is wrong?

 

Lube the hinges, locks, lube everything that moves. If that don't work replacement of internal parts maybe required.

 

my passengers side door does the same thing... pull the handle, inside or outside, and the door does nothing, it is missing a few parts in the door and i didnt know it till i for some reason went to that door... and it no worky

 

sounds like the meal piece that is connected to the handle that releases the latch came undone/broke

 

This is a common problem and there are a number of existing threads about it that can be found by doing a search.