MY car when we are scanning it with HPTuners has a hick-up from 5200 to 5800. It shows it on the dyno graph but does not show it in the scanner. The map sensor reads at 99kpa through the pull, but at 5200 starts fluctuating from 98 to 99kpa. We have replaced the map sensor and we have made sure that the map has a 5 volt reference. Both a check! We are in speed density so no maf sensor to play with, although we had the same problem with the maf on it. Has anyone heard of this problem? Or does anyone have any ideas? By the way the car will pull throught the little hick-up and continue on making power. But just has that little hesitation. PLEASE HELP!!