I got a 1979 cutlass ls swap 5.3, I have a th350 trans with the Dakota digital sending until electrical speedometer and I've researched the hp tuner site and YouTube on how to calibrate my speedo. I got far as to putting in my numbers in the tire wizard on hp tuners and changed my speedo ratios. Now when I come to a stop, I have like a hunting idle. Any help would truly be appreciated.