[W126 Coupe] Shaky Start!!

[Camran Nassiri]

I have a 1990 560SEC (52K miles) and a 1991 420SEL (110K miles), when I 
start both cars the the engine shakes for a few seconds (maybe 15 seconds) 
before it settles down and rides fine.  I have replaced the ignition wires, 
plugs, rotor and cap to no avail.  I am not sure if this is caused by fuel 
injector drain or what.
Any advice as to how to solve this problem; or, any advice as to alternative 
way of starting the car to avoid the shakes (like turning on the key for a 
few seconds before crancking the engine)?  Any help is appreciated.

Camran

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