why would you want a new one when you have something as rare and nice as that?
Post a pic!
Have a look at the idle mix screw when you have baffles in.....if it is still plugged in its tower, unplug and adjust....so it is set midway between stumbles in a warmed-up engine.
before then, just make sure you have no vibration-related electrical issues. i.e. coil terminal wires and battery connections tight....