Wait, is the engine revving yet the vehicle not moving when in gear, or is the engine staying at low RPM's even when floored? If the latter, are you certain you're fuly fueled? If yo've definitely got fuel (don't necessarily trust the gauge), you could try changing the fuel filters...

Just a thought...good luck!

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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