My page keep on jumping up and down in search result!!

It jumped from 8 to 86, and from 86 to 8 five times in 8 hours. And it keep on jumping in this days.

What is going on?

I have added lots of high pr backlinks in this week, I think, they may being effecting or something.

But, it jumping for nearly 10 days; is that, GG is fooling us all now ???

I have seen lots of people are complaining things like this.