Hi I have a 90 300SEL and it will start up great stumble and stall. It might do this two maybe three times then its fine. Only when cold. Also if I feather the fuel pedal I can keep it going and avoid the stall. Any suggestions? 120,000 klm and just had a complete tune up with plugs,wire,button and cap. New Voltage Prot. Relay and other than that works good.

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1987 300 TDT
1990 300 SEL