I have read EVERY thread on this forum and preformed ALL the suggestions to solve the surging problem on my JD LA120. Nothing , to this point has stopped the surging, low idle only. Other than the annoying sound it makes, is there any reason I can't run the mower? Runs great at anything above 1/4 throttle. The only part I haven't replaced is the float needle. Could this possibly be the problem? I've had the carb. apart three times. Total frustration! Somebody please send me the magic trick that will fix this issue.