You shouldn't even have needed to mess with the ecu tube for the AEM CAI
As for the shaking noise...here are some possibilities:
1.You didn't tighten everything as you should have...especially the connector flange on the fender well.
2. You didn't position the Intake
tubing far enough away from the fender or fender plastic...thus the rattling sound.
3.You didn't cut a big enough hole in the fender well plastic for the Intake
to have a little room to move. The whole engine moves slightly when you use the gas...so this is going to move the Intake
as well, thus, check the size of the hole and make it a little larger.(Use a razor blade cause it cuts it like butta).
First check to make sure everything is tight...then, if the problem still pursists...cut the plastic better and reposition the Intake
...in that order. My AEM CAI Intake
has been on for over a year and I haven't had any noises or problems. Good luck bro.