I was on my way to work this morning; nothing changed, same fuel as the day before. Fuel got low, pulled of highway to refuel. Entered highway and began to accelerate past 45 mph. Around 55 mph I noticed my A/FR was surging like crazy and I felt the engine surging with the rising and dropping A/FR. I went into boost and the A/FR refused to rise above 10. When I got closer to work and slowed below 45 mph I noticed that the erratic surging had subsided. But, as soon as I accelerate over 45 mph it starts again; no matter what load I'm under.
I'm seriously debating whether or not I'm going to change the car back to NA overnight; this makes me very uncomfortable.

-Any suggestions?