I don't think this could be an issue, I had the same intemittant problem, would come and go with months inbetween. Ended up being a failing crank position sensor.

99 CSVT Green/Tan # 84 of 2760 Built on Wednesday, September 30, 1998 15.376 @ 92.00 MPH Stock 75,000Km 96 Contour GL 2.5L V6 ATX 170,000Km