rx7

iam been looking for a car and today i went and look at a 91 rx7 and i wanted to know a few things from somebody who knows more about them/when u take off in first gear the shifter jumps up and down and i wanted know how does the rotory motors like turbos if any could help me i could use it thanxu can email me at jrmyb825@yahoo.com or give me a call at 864-845-6120 i would like to talk to someone quick because iam thinking about going and picking it up tommorow thank u for ur time