Engine Bogs Down at Highway Speeds

[ChristineX5]

Had a chance today to run the X5 out on the highway for 30 miles. HUGE difference in power and pickup. Now the IDrive controller shows an average of 22MPG instead of 11MPG being the best!!! More power than it ever had during any time of my ownership of this vehicle. So that INTAKE BOOT that goes to the throttle body was leaking air or should I say "pulling air" in at that loose joint for as long as I have owned the vehicle. Lucky the lean condition did not harm anything.
As I mentioned in a prior post from yesterday, I found the entire intake boot loose. The big hose clamp on the throttle body was not at all tightened at the bottom. The intake assembly was just pushed on loose! Some shoddy mechanic taking the easy way out.
And sure enough...this is the area of the engine bay I was working on when I changed the heater control valve. So I bet I bumped the intake and cocked it over a bit farther than it was, causing the loss of power to be noticeable when pulling the trailer up at highway speeds only on the way home.
--Thank you again-- to all those who contributed to helping me with this issue. A strange one indeed, but we got her fixed!!! (: