It's getting to much air or not enough fuel.hello, i have a toro model 26622, serial num 00180001 and it has to warm up on choke for a minute and after that it surges. any help would be appreciated! thx
If there is a fuel filter (not familar with this model), clean it.
Leave the gas cap off and try it.
Spray some Carb cleaner/starting fluid around the intake flange while it's running and see if that changes the behavior.