quit spraying that crap into your car!
you are doing major damage.

check the normal stuff, glow plugs, filters etc.
Probably a plugged filter or nasty fuel.

good luck

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1992 300TE 4matic - Just obtained 12/22/06
1983 300D - SOLD
1997 Dodge 2500 - CTD 400+HP, 1100ft/lbs torque