i had the exact same problem with mine. i tried to tune around it. but i had to make it pig rich to not misfire. like in the 10's when cold and low 11's when warm. i could feel it loose power during the 2500-3000 rpm band now only thing replaced is the aem. i have it in the 16-17's afr and no misfires (no load of course normal cruising). and now im gettting 19mpg with mosly city driveing(ruffed in tune). i had also replaced my ecu with a reman prior to that i replaced the ecu caps. also tested my emanage ultimate with a known good one. only thing fixed it was replacing it with a stand alone. both tunes were in speed density. i didnt even change the plugs or oil witch is overdue.
i dont know what exactly was going on but its completely gone now.
