My car shakes real noticably at idle when I am running diesel. Almost feels like the engine is about to die.

When the car is running veggie fuel the idle is as smooth as silk.

Since I run veggie fuel 95% of the time, I haven't worried about it too much, yet.

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Pictures of the MB: http://s230.photobucket.com/albums/ee41/EricandRobyn/1981%20Mercedes/

1981 300 SD with a Goldenrod water block and Injetor line heaters. EGR is missing

1999 F-350 with HP X-over, Dahl 100 Fuel Filter, Coolant by-pass filter, CCV mod, Tymar intake.

Both on single tank WVO blend