Got a little question:

83.5 Westy
Hesitates in 1st and 2nd.
Little power up hills.
Stalls/hesitates after 2 hour runs.
Cat ok.
O2 OK

Has anyone solved there hesitation/stumbling/stalling problem?
For over a year I have read MANY posts about this problem and have not
seen many replies that the problem was fixed.

Could it be AFM?
I also pulled the muffler.  Should one be able to see through a muffler.
I see no daylight.  Wondering if the muffler is clogged?

Anyone have any thoughts?  Any help would be appreciated.

Jim W.