Originally Posted by
joeh5088
Anyone ever had the low speed needle move/turn or change setting while driving their car?Can this happen due to vibration?
I had this happen on a Mach 427 engine some years ago - but it was the main needle that was moving on its own. The o-rings had shrunk and hardened with time. New o-rings cured the trouble. I wouldn't doubt the same could happen to the idle mixture needle. Worth looking into IMO.