1989 300E

I recently acquired a 300E and encountered difficulty starting the vehicle. It had been sitting for approx 6-8 weeks. The car would crank over but the engine would not engage. Only after numerous attempts and moderate use of the accelerator pedal it would actually start. After the engine started, the idle seemed rather low - 550-600 RPM, and the engine would keep running only with encouragement from the accelerator pedal. Once the car was driven, it would run well.

I have confirmed that each cylinder is receiving a spark and also confirmed that the wires are fine. May I assume that this issue is fuel related? If so, what would the diagnostic steps be?

Secondly, I have noticed that the seatbelt warning light remains on all the time. What would this be caused by and how would I resolved this issue?

Lastly, the powered passenger seatback adjusts for recline position but will not incline back to a vertical position. All other functions of the seat are fully operation. How would one diagnose this problem?

Many thanks in advance for any assistance that may be offered.

Kind regards,

Keen