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(90K miles on engine) My automatic transmission is not shifting when it should. It runs the RPMs very high before it shifts, and then sometimes clanks/jerks pretty good as it shifts. Adding trans fluids sometimes makes it a bit better and sometimes not. When I last had work done (injectors cleaned/replaced) the guy said the computer sensor that told the engine when to shift was bad and that it was replaced. And it worked when I got the truck back, but its really bad now. I'm afraid to go back to the same guy (Sunrise Ford) because I believe he gouged me. When I first got the truck (80K, 5 years ago) the trans was leaking and another shop replaced the seals. What could be wrong? Thanks for your help.