curt1,I did a slow approach to rwy 35 at HLI with and without app. engaged, but I did not experience any stutter.Could be your ai for aircraft is to high or scenery demands are. Try lowering traffic and boat traffic. Anyway Im sure you know all this already. When I tried without approach hold on I did it at 50 ft alt and thats very close to ground. Just keep trying different settings. Different runways have different scenery.