I am firts time here a month ago I got a vue with the 3.5 engine I had to change all the motor mount but I also have all 6 cylinder miss fire . I am shore that some post it a answer on it it hard for me to search for because I write this from my phone. If someone have a answers I need help.

 

Have you replaced the sperk plug wires recently or had the off for some reason it almost sounds like they are cross wired check your firing order and make sure it is right.

 

Agree with the wires and firing order. Check for corrosion on the coil packs too and make sure the wires are firmly connected on both ends. I've been tinkering with cars for over 40 years and have NEVER run into a situation like yours. Go back over your wiring harness and make sure you didn't pinch some wires when you replaced the motor mounts.

 

Firing order wiring would be the first place I'd look ...