I have a 1994 dodge caravan 104000 miles 3. engine 4 speed transmission [rebuilt 13000 miles ago] any way transmission pulls good until warm then it won't pull any more , please help

Start with changing the fluid and filter. If it was changed recently did you use the correct fluid? Are you getting a Check Engine caution light or whatever it's called on a 94?

well sees I was all wrong I was given this van and was going by what I was told ,any way it moves ok when warm but won't shift once you stop until you shut it off and start again , almost everytime you stop you have to shut it off and start over again . my step father gave me this I tried to get him to have it checked but he didn't want to spend any money it and he has it , where I don't sorry