I own a S5 Turbo, just got it recently. I've noticed that to make the car drive smoothly, you need an EXTREMELY steady right foot, because any movement on the gas pedal will cause to car to jerk back and forth, especially in 1st and 2nd...I don't think this is normal, but I have no idea what the deal is behind it. Any help will be greatly appreciated!!

 

If the car bucks during deceleration then check and adjust the TPS to 1 volt after the car is thoroughly warmed up.

 

could it not also be the differential to drivetrain mount being broken? seen that on a number of rx-7s before...and I'm assuming its not just a chattery transmission?

 

TPS is easy to adjust, and therefore would be the logical place to start.

 

Front mount on the diff is another possible culprit. Is there a *clunk* from the rear end when you give it throttle?

 

My factory TPS was so off, you couldn't accurately adjust it. It was like throttle on or off, no in between. TPS replacement cured that issue entirely.

Actually, under extremely light throttle situations, you'll notice the engines runs on one rotor with a proper TPS.