You might consider running a CARFAX, they aren't always 100%, but it could give you some good info. I had a '95 and never had a problem during the four years I owned it. This is a ZETEC, 4 popper correct? If so take a look at the maint. forums, lots of good information inside.

1999 Toreador Red SVT, DOB 4/22/99, 2005 Of 2760. "Many posted questions are answered by farm boys"