1991 Mercedes-Benz 420SEL Questions

All 1991 Mercedes-Benz 420SEL Questions

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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 thum...
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
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
where do I spray starter fuel? how do I find air intake pocket?
Had old battery so replaced it with new one. Checked alternator and it is good. Will start with a jump and after freeway drive. Will not start after it sits overnight next day without another jump?
The light and buzzer works from any other door in the car