Wow suprised no one mentioned this... check out your cam sensor and crank sensor. They are located on the drive belt side at the end of the front side cylinder head. Cam is up top pretty easy to see and the crank sensor is down below just to the right of the damper. If these go bad it will do the same thing gauranteed. Typically these sensors should be replaced every 60k miles.

-Mike 98 Contour SVT Toreador Red #49 of 6535 Built on 3/25/97 WR Headers, Borla Cat-Back, Torsen T2 LSD, K&N Short Ram, S-AFC and Focus Shift Tower 85 Camaro 1969 358ci, 97 TA interior, 91 Z28 GrdEfx and Aero Wing 255rwhp