Fuel trims look good and I sprayed every inch of motor when running high idle with no affect . I will reload factory tune, BUT I will say this motor has had the same tune in it for 2 years and this is something that developed. When running normal my blade is 3-4% , 19% would seem way too much for an idle ?? And my HIGH idle occurs I see the 19% , when it's running fine which is MOST of the time it's 3-4%