I was wondering if someone could give me a little insight to what i'm seeing. I am currently running a 91 octane tune and was starting to get some weird surging feeling when I would kick it down a gear and give it some gas but not wot. Yesterday I kicked it down at wot and the rpm's shot up but the engine lost power and when the rpm's came down it was sputtering and wouldn't run right. I shut the car off and restarted it and seemed fine. I took the 3 bar out and installed stock map and flashed back to stock to see if it was in the tune and car seemed to run fine. I kicked it down on the interstate today and it did the same thing, rpm's shot up but no power and then ran like a bag of shit so I pulled over and restarted it and got it home but its getting worse. I did get a check engine light that stays on and codes P0300 P0301 P0302 P0303 which all are misfire codes. Any help would be great. BTW it is a 17' non ppo that is all stock except 3bar and tune.