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1991 Mercedes-Benz 420SEL Questions

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I have a 91 Mercedes 420 sel, am having issues with vehicle randomly surging while driving, almost like you lift off accelerator, if you push gas pedal, the fuel consumption gauge moves like you are flooring the gas, but the car doesn't respond, is ...
My light switch seems compromised. When I turn the switch the running lights do not work. My Brake lights work, the front right headlight works and my blinkers work as well. The front two lights only work when I switch on my brights. Is this a ground issue in the switch or just somewhere else in the vehicle? Also, none of my dash or gear selector lights work but the door lights work as well as the overhead cabin light. My fuses are all in check so I have no idea outside of my current knowledge. The vehicle as of now only has 152000 miles. Any insight would be greatly appreciated! Thank you for reading!
what is the voltage supposed to be on the fuel pumps
the car has not been cranked in 7 years I just bought it
When I am stopped at a traffic light. Oil pressure drops to number 2 and feels like cars gonna cut off. Also does a thumping noise and car vibrates. Put car in netural and it runs fine. Put it back in gear starts thumping noise. Drives normallay. Just at a stop does the thumb. Checked all fluids and everything is fine. This is the second time this has happened. Second time it started after I put gas in the car then it started the thumping and oil pressure needle jumbs up and down. When got to my desanation. Put car in park and runs like a champ. Dont understand whats wrong with it. Any ideas before I take it in?
SAME ISSUE WITH THE CAR DIFFICULT TO START. HAD TUNE=UP CHANGE FUEL PUMPS (2). WANT TO CHECK AIR MASS FLOW ISSUES BY CHECKING THE SENSOR WIRE BEFORE MOVING ON.
Need to replace alternator belt
something warm up & it wont start
my 420sel idle high when in park but not when driving why
when driveing it idle well when stoping and putting in park it idle high
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