Jay, I know where you put gas. I've heard bad things about that place. Do your self a favor. Drive the car until its half or less in the tank. Go to a Shell and put some V-power. At that time also pour some fuel cleaner in there. Techron is good stuff as well as the stuff BMW has at the dealer. Drive the car after you do that for a few hours and then when you get half way again, go to Shell and fill her up once again. This will take a few times but this is what I was told from my mechanic when I had the same problem as you last year. Good Luck. She will be working just fine...