Originally posted by RogerB:
It's a 99 Windstar
That's your problem right there.  
Seriously though, we had a 99 Windstar for about 2 1/2 years. I had engine problems with mine, nothing too serious, pinging/detonation, hesitation, rough idle, tranny problems too, rough shifts, Ford said it was all "working as designed" or expected, or they couldn't reproduce the issue. It never left us stranded but I'll never own another Windstar after my experiences.
I say drive it yourself and see what's up, that's the only way to know for sure.
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