My WK started bucking really bad after I had a mechanic look at it. I noticed that he pulled a vacuum line while it was running.
After he looked at it, the check engine light was on but I didn't pay it any attention. After driving it for a while, the engine light began to flash and that when I started to worry.
I then noticed that when I accelerate heavily, I get very bad surging/bucking at around 40mpg @ 3,000rpm.
I checked the hoses. They are connected. He only pulled on hose and immediately put it back on.
You will get a very good look at it towards the end of the video.