The car will down shift out of 4th to 3 rd gear and will lose power it will not shift back up and will not go into 1 st gear till it is shut off for awhile , I thought it was a trans problem took it to a shop they said it wasn't the transit was a running problem. I have had a few different places look at it and no one can seem to fix it . We have changed the fuel pump and filter , the t.p.s the coil packs wires and new plugs , still can't seem to get it to run any better. if someone can tell me what is causing this please let me know .