Normal
Some can flame if they want, but I had surge when I first got my truck. It happened a few times in a parking garage within a minute after start and just creeping around towards exit. Wasn't as bad as yours, I mean no fault lights. I had no mods at the time, but it seemed to rectify itself after I started using 91 gas. So I asked dealer about the first tank and the said they put 87. I just attributed it to whatever they used in that first tank.