LS400 smoke at starting
 

I have had a couple LS400's some smoked more than others at start up, white smoke from exhaust for the first 10 seconds. The one I have now is a 1993 only has 82,000 miles, just tuned up(plugs wires cap rotors) and it smokes more than all the rest.
Does anyone have any info as to what causes this and how to stop or lessen the smoke? [/b][sm=pimp.gif]