I have a 2007 Lincoln MKX, 91K miles, with the same issue of missing at low rpm as described in this thread. I tried the higher octane gasoline, and it helped a bit, but still had the issue. Turning off the overdrive to increase the rpm was a temporary solution. I went on Ebay and purchased a tune up kit which included (6) new motorcraft coil packs, spark plugs, and intake manifold gaskets for $199 from a ford dealer online. I also searched online and found the instructions for a 2008, which was the same except the 2007 had an extra connector on the back of the manifold. I started the project at 10AM and I was test driving at noon. I am not a mechanic but have worked on cars most of my life. It has been a month since I did the repair and the car now works perfectly. Note: the gap on the old plugs was .020 wider than recommended.
