Cold start valve on 1992 Mercedes-Benz 300E

Problems with starting. Replaced distributor cap, rotor button, spark wires, spark plugs and crank shaft sensor but
still having starting problems and car running rough. Suggestions. Thanks

Asked by for the 1992 Mercedes-Benz 300E
make sure the o-ring under distributer cap is not worn. check to see if wet inside and any wear on the o-ring.
Thanks. My mechanic in addition to changing the above parts had to change the idle control valve. No more rough riding and car is starting up and running tops.