I just did my 01 5.9, I set distributor close to where it showed in book then used the Snapon scanner to sync it (it did it on its own) seems to run better. I just overhauled the trans and Van went from 15-16 to 12 mpg (4.10 rear) we’ll see how it does now. Also I changed nothing on the engine other than trans. One other thing I had to adjust the cable to the pressure lever (shifting hard)