how many miles? 132,000
look into the trasmission cooler mod, pronto.
could be shift selenoid... there is also a button on the stick shift that makes it shift way late.. is that pup pressed in? That would be the overdrive button, right, if so I have tryed pushing it with no change
I would also like to add that when this problem developed I also began having a little hesitation when I accelerate, like its flooding a little when I give it gas from a dead stop.
Yesterday I drove it to work and did not have the hesitation or shifting problem, it is only happening at certain times it seems.