1991 300ce cold start problem

[Cliffy300CE]

I have a 1991 300CE and for the past while the car has been having difficulty starting in the morning or when i leave it for a couple of hours and then return. The car requires 3-4 cranks to start and when it does start i have to give it some gas and it starts out very groggy and then goes right to normal. I have read some posts about over voltage protection relays and cold start valves but have not gotten much from them. I checked the 10 amp fuse on the over voltage protection relay and it was fine. I do not know where the cold start valve is on the car to check it. Wondering if anyone could shed some light on the subject.

Cliffy