Not only was the install difficult, but it seems that there is a surging of the rpms. When the car slows down the rpms stay at about 1500 (almost like the gas pedal is still pressed) and eventually goes lower when the car completely comes to a stop but not before there is a surge of the rpms at around 1100. It goes up and to about 1200 and then goes down to idle. I have disconnected the battery 2 times and also pulled fuse 11 once. Has the happened to anyone else? What could be causing this issue. I am really starting to believe this whole exhaust change was a big mistake.