2007 Mercedes-Benz S550 4MATIC Questions

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Engine fans runs constantly after about 15-20 mins of driving
Not very often shifting not properly advancing to next gear. Unless turn the engine off and re start.
I would like to change my tail lights to the 2009 or the 2010 model lights. I also would like to change the front bumper, or can I just change the fog light set up?
I have to open the hood and bang on the computer if the car won't start and I've been to the mechanic for this issue over and over and same results. I entered the car today and it wouldn't start I had to open the hood and hit the computer and then the car started up.
how many in total?
lately my car feels heavy whenever i apply the gas pedal.
it feels like is losing power. will that be the spark plugs?
I never change them since i bought the car 1 year ago.
the mileage on the car is: 91,100.

Thank you
The yellow airmatic malfunction comes on and off occasionally
The yellow airmatic displays, affects ride, what is the cause?
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