Coast FC adj: Used to tweak the lower limit on
coasting fuel cut. Enter a value in here when you select an idle point greater than 900 RPM and observe any odd behavior while coasting down or letting the revs drop. As a general rule of thumb, you should enter the difference between your selected idle point and 900. So if you select an idle of 1100 RPM, you might try entering 200 into the Coast FC adj box.