Foxfire, Im holding my ears from you screamin[/emoticons/emotion-2.gif], but I had the same prob after bigshot/pc3 install. Based on good info from various sources on this sight, went in and modified bigshot/pc3 map. Adjusted 0 line to 10, got rid of hesitation, but ran a little too rich at idle. Went back in and changed 0 line to 5 (all the way down the line) and hesitation gone, just right at idle! Worked for me, but you should know, there are many variables, try it and see if you like it, you can always change it back.