Slydynbye
Will ride for Pie
I would inspect the little secondary filter just in front of the Air cleaner. If it is in pieces or missing you could have ingested those bits into the carbs.
I replaced mine with a piece of Terry cloth about 40k miles ago and just inspected last week, still good.
Along those lines, since you had a shop do some of the work, I wonder if they used any cleaner that might have damaged a diaphragm on one of the carbs.
Or you could have a ripped diaphragm. Your description of running on 3 cylinders sounds like it could be carb related.
I replaced mine with a piece of Terry cloth about 40k miles ago and just inspected last week, still good.
Along those lines, since you had a shop do some of the work, I wonder if they used any cleaner that might have damaged a diaphragm on one of the carbs.
Or you could have a ripped diaphragm. Your description of running on 3 cylinders sounds like it could be carb related.