My 1998 Mystique did the same thing. Did it for months, eventually it totally failed to start. The flywheel on my car was warped, and the car would start every one out of three times. Took it to the dealer, they had it twice. have a dealer inspect your flywheel, if it's bad and needs to be replaced, ask them about getting Ford to pay for part of it. It is an expensive job, would have cost me 1500 dollars, but Ford payed for all of it except the 250 dollars which was for the starter I ruined trying to start the car.