I cant figure it out last week my ranking were on first page ranigng per keyword from #2 to #6 now this week most fell to 166 what the hell happended?
If it's a new website, then Google has found a stable ranking for you. Usually new websites, get ranked highly, as Google is unsure of where to place them.
This normally happens once you make alot of changes to the site, just give it a few days for google to come back around, also try pointing some fresh links to the site.