Welcome Joe!
I normally advise against just throwing parts at a problem. Check the airbox and air filter for anything that may not be right. But it sounds like the carbs didn't get cleaned properly. If you have 10yrs experience as a mech, then you're more than qualified to do this work yourself.
Honestly, getting the carbs out of an 04 (pregen) is a bit of a pain in the behind, but not impossible. There is a great video somewhere here on the removal process. As far as cleaning the carb, it's not as hard as it sounds. Once the carbs are out, remove the bowls and then the jets and start ensuring everything is clean and clear. Also, do a search here for "hidden passages." These airways of the carb must be clean and clear as well.
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