How about valve clearance? Has the valve adjustment been checked? That could cause the STARTING problem.
The idle circuit needs imput from 4 sensors to operate correctly.
Idle contact switch, decel switch, air flow position sensor, & speed sensor(hall effect) imput.
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
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44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)