The good news is you'll get solid advice from the guys on this board...they're helping me on my 200
Given your description, the first thing I'd try is simply turning the air screw out. Actually, you need to know where it is right now, so turn it all the way in and count the number of turns. Based on that figure, back it out another .5 to 1 turn from where it was and see how she responds.
If it's still giving you a burble, might need a leaner pilot jet (which is something I'm planning to do on my 200). You'd need to know what's in there and then go 1 step lower (or more). I'm switching from a 42 pilot to 40 in the hope to clear up some pipe drool.