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I had this problem with a Jeep Cherokee. There's a pretty good page with a diagnostic solution for Jeep Wranglers. The steering/suspension systems likely differ, it might help.
Diagnosing Death Wobble and Fixing Non-DW Shimmies and Wobbles - Jeep Wrangler Forum
There are also some threads at...
Could be some useful info at the Diesel Place regarding alt-fuel and modern diesel engines.
Bio-Diesel/Alternative Fuels and Supplements - Diesel Place : Chevrolet and GMC Diesel Truck Forums