Q: left front end droops down overnight and car whines when you accelerate on 2001 Mercedes-Benz S600

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front end comes back up when prompted by pressing the button--car had driver side coil pack and plugs replaced but still does not accelerate as it does
(1) Answer
air suspension in front end. possible puncture in bag.
front end issue possibly effecting ecceleration.
should inspect plugs to insure install was good. i am wonderring why you only did the one side though.
rec. fuel system clean. ethanol treatment to 1 tank premium fuel. your ride uses premium any way so should not be an issue. clear out ethanol build up.
rec. oil stabilizer treatment with next oil change. this will recondition seals and cylinders(improve compression).
rec. upgrade conventional air filter to high air flow design. help engine breath, better all around performance.