new glow plug ??? mayeb try different type glowplug. i had a os 50 doin the same thing .. used a enya 3 instead of the os 8 works great. how many turns out is the main? soudns like the idle needle coudl be a little rich too if its not ideling is the throttle linkage set up right?.. i think leave the idle at factory, then work on the main needle for the time. set it rich then slowly wind it in until it transitions from idel well. the os 32 too shoudl idle great. becasue u don;pt have to run it so rich down low like a TT well at least thats what i found. others might have some other opinions. . . i had an os 32 in a shuttle i remmeber for run in it was about 2 turns out with the idle screw at factory setting. . of course different climates and atlittudes and different mufflers will change it too.

hope u get it sorted soon.