I have 2 friends that both have the same problem with their 3W 80s,,

on the ground the engines run and idle great, as they should,,

in the air they will not come down to an idle,, they stay at a high idle,, too high !!

this happes at low-speed flight just before landing, the engines idle to high to get the planes on the ground,, richening up the low-end needle only make the engines too rich for flight,,

I have seen it happen to 1 engine, and this engine does not seem to be leaning out,, this engine has a ridged throttle linkage so there is no slop in the linkage,,

any thoughts on this ??

Jim