Rough start 94 e320

[94Benzo]

Hello guys im having some issues with my 94 e320.
It has around 230k miles and a new engine harness replaced around a year ago.
Everytime i start the car it just keeps cranking and whenever i hold down the gas pedel it begins to start. Usually in the morning it starts perfectly, but during the day i can bearly get it to start. Any suggestions on what could be the problem?

Also i to have an issue with MPG, it seems that i am only getting 13mpg when the tank is full to 1/4 empty. Any suggestions on what to help with mileage?

Thanks for any help you can offer