Yeah, sounds like an early '99 Super Duty.

Check out www.thedieselstop.com (if yours isn't a PSD, they do have a g@$$er forum as well). I'm a regular over there too; it's a great site!

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2001 VW Jetta TDI, 5 speed, daily driver
1991 Ford F-350, work in progress
1984 Ford F-250 4x4, 6.9l turbo diesel, 5 speed manual
Previous oilburners: 1980 IH Scout, 1984 E-350, 1985 M-B 300D, 1979 M-B 300SD, 1983 M-B 300D
Spark-free since 1999