Won't rev higher than 2k
I have a 2006 Audi A4. Just yesterday I accidentally switched it into standard mode while driving, turned without realizing, then switched it back right away when I noticed it was on standard. Today, as I'm driving, if I push the gas and rev it up to about 2k then it would start jutting. Almost felt as if I was on a really bumpy road or going over a bunch of speed bumps. Anyone have any idea what I might have done? How to fix?