Just looking for some ideas on what could be causing cold start problems and a high idle speed on a 1991 300E

Over the past 2 weeks cold starting has become more difficult, the normal 1 turn of the engine is now 7-8, usually requiring a second crank to get it to catch. Once started you can turn off and it will start first time no problem.

The second problem is a high idle even when warm of about 1,000 - 1,200 rpm.

I am wondering whether they are linked, perhaps to the Idle Control Valve which is dead or needs cleaning out. I was also wondering if the OVP relay may give these symptons if it had gone.

Any thoughts appreciated.