I just put this 91 TB on my 87 manual, the problem is, the accelarator pedal is really hard to press now, and the car wont idle because of this. The butterfly in the TB is much harder to open, Im thinking there was some other cable on the 91 that prevented this from being so hard...I can drive the car fine, just wont idel..has anyone put a 91 TB on a 87 turbo?? Im curious to know how you softened up the spring rate on the butterfly, or how to get this beast to idle...Oh! no code 51's....