Our 1986 300E never starts on the first try... She always fires up on the second with no worries.
She had been sitting for many many months so fuel in the system is a concern. We're going to burn down the tank to close to zero then add in some good high test fuel. We'll also add a fuel treatment (Red Line) to the fuel as recommended by a MB dealership here in Dallas.
Anything else come to mind?
1986 300E 85k miles "Eva"
1988 300E 91k miles "Autto" R.I.P