Help, x5 running strange

[culthero]

Ok, so first off I have an 01 X5 with the 3.0 and Auto. 107K miles.

Last week I accidently put in regular unleaded (was tired and not thinking), only about 1/4 of a tank when I realized it and stopped.

2 days after that I was in line at a drive thru, when all of a sudden my X5 started shaking. When I would accelerate, it was bogged down and it had no horsepower. RPMs were reving high until it hit about 4th gear it then felt smoother. At every stop light it was shaking though.

I went straight to the gas station, put 93 octane fuel, and it went away. I didn't siphon out the old gas. It did again yesterday, so today I put in an octane booster with more 93 octane fuel, and it still does it. It will only start to do it when its stopped, and usually goes away after driving a bit, but then will come back after a while of being stopped (like at a traffic light). When it happens, it accelerates like if there is no air going in or a clogged injector...not sure...just bogged down is the only way to describe it. The shaking is only when I'm stopped.

What could be the problem??? It was running great prior to that, but now I don't know what to do? Any ideas what it could be????