help tranmission problem

HELP ! I have a 1996 isuzu rodeo automatic it shifts rough i took it in to transmission place they said it was the epc valve they changed it and it is still happening can anyone tell me what it might be we also did check the carrier bearing and it was good please help

Low fluid?

I'm not sure if you have a range selector?

Weak battery alt? Isuzu do strange things with weak electrical systems.