Initial daily startup problem
When my 1897 190E Benz is started each morning it runs very roughly and frequently stalls out when the transmission is put into reverse or drive. Strangely, if I wait about 30 minutes and try it again the car runs fine. The only thing I can add is when I unscrew the gas cap there is a significant sucking sound (is there a venting issue?). Things I suspect are condensation in the fuel delivery system or perhaps a cold start sensor.
Anyone have any ideas?