1996 Ford Thunderbird Enigine troubles

My car died a few weeks ago, the speed suddenly dropped and then it lost power and shut off. The car will start, but only for a moment and runs really rough. Before this happened, the only other problem I had with the car was that sometimes while driving it, the speed would get "stuck" even as I stepped on the gas. After a few seconds, it would rev up and continue to increase it's speed as normal. Thuis happened about once or twice a day. As far as the engine problem goes, my mechanic says it's being flooded with too much fuel. The fuel injectors and spark plugs are fine. The CAM and Crank positioning sensors have been replaced, along with the fuel pressure regulator and computer. I bought this car only a month and half ago. The gentlman I bought it from had many parts replaced and it was just inspected in October. Alot of money has been put into this car and various mechanics have told me its in great shape for its year. I've taken it to other mecahnics, but no one can figure this out! I'm running out of patience and money, can you please help?