I have a 2008 Lincoln MKX which is basically the same thing as the Ford Edge. The shutter at low RPMs and constant jerking exactly the way that you guys described has been happening to me for many years and it has been really annoying. I have read through these forums so many times over the years with no clear answer. I decided to go the cheapest route and replace the 6 spark plugs. I was able to get to the front 3 very easily and they looked pretty old. I did not feel like trying to access the back 3 because they looked very hard to get to so I decided to give it a test drive with just the 3 brand new ones. I have been driving the car now for one month and it has NOT done the shutter jerking once! This definitely fixed the problem for me. Before changing the plugs it would do the jerking every single time I drove it. I will probably change the other 3 in the near future but here is a picture of the ones I pulled out. They might even be the original spark plugs and this car has 160,000 miles on it.
