need more details then.... you described te same thing as to what other bad tps or map sensor people say. the car is jerky....boggiing...shaking....struggling....vibra ting...when you slowly accelate at a certain speed/rpm.
there is nothing in your suspension system (if you will) that will make the car shaky, jerky, vibrating at 35-41 mph. with suspension it would do it all the time not just at a certain speed or rpm.
i take it that you didnt look up any info on tps or map correct?