When the car sits for a week or two this is what happens. It starts fine and then runs for about 15 minutes with no problems . Then it starts to die on accerlation and finally just dies. From there it is very hard to start. Once I get it running it will run crappy for a little while and then runs fine. If I run the car every day as a daily driver then I have not problems. What can it be. Run only premuim fuel.

Thanks

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Moohampshire
1988 300E 124K
1994 Volvo 850 Turbo 115K Killed by a Cement Truck
1992 300 CE 95 K
1986 300 SL Euro 96K