troy built 18.5 briggs & stratton
Engine starts and runs well on full choke or idle speed only. Anything else it stalls within two seconds. I've loosened the cap; cleaned the bowl and tried, as best I oculd to blow out carb ports; tightened manifold bolts; plenty of gas seems to be gravity fed through line. Should I remove carb and boil or whatever to thoroughly clean? Less than 100 hours. 3 years old.