Running problem sounds like secondary ignition problem, ie; coil, dist cap, rotor, or wire breakdown.
The SRS system can be diagnosed with code reader for faults, most likely faults are charging system & steering wheel contacts.

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MERCEDES BENZ MASTER GUILD TECHNICIAN (6 TIMES)
ASE MASTER TECHNICIAN
27 YEARS DEALER M.B. Shopforeman
190E 2.3 16V ITS SCCA racecar