Transmission not downshifting.

Okay, so about a month ago I figured I would changed my fluid filter and gasket since the mileage was not that high. Two weeks after that pulling out from a dead stop I felt something like a slip of some sort the engine rpm's went higher then car speed then it grabbed again not sure what that was about. Then from there on out it took it a lot longer to up shift threw gears until it got to the point where it did not want to shift at all until you accelerated hard. So I was told by the guy at the transmission shop that it could be my distributor. So I took it out of the transmission and he did something to the bearings and now for about two months straight it has been shifting somewhat smooth it just pulls out in second gear and as soon as it changes to third it bogs down and takes it a second to catch up speed, but will not downshift to first at all sometimes it downshifts to second when coming to a complete stop. I can feel a clunk in the front end if I change the gears manually it acts if the problem is not there it shifts great manually all threw the gears. My tv cable was spliced near the throttle body so I replaced it hoping that would fix it, but no luck. Also my tv plunger valve in my throttle body was sticking and I replaced it with a new spring I am not sure what to do except to put another transmission in it. I am running out of options.