Added the Edge EZ about a month ago. level 1 good, level 2 good, level 3 weird. When driving down the highway at 75 mph good then if I go up to 80 to 82 and let off the engine shudders till you get under 80 mph. Is there a speed limit on this unit or do I have some thing else wrong. Any one else have this problem. Need fix.

 

I never set mine above level 1 on my previous truck. 100k miles - never any trouble and all the power I ever needed. The EZ increases fuel pressure only, so you want to take it...well...easy.

 

I've had an edge ez since 2004 and I have never had any issues like you state. I have set it at all levels for months at a time.