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This is the screw on the bottom of carb that did affect the idle.under the carb that has a ajustmen screw but not a hi / low like you mentione

I was about to remove carb to clean but decided to play with throttle adjust screw first just to see if that would make any difference and the problem was solved - one of the easier fixes for sure:)...

OK will try that thanks

I have a craftsman 536.886120 snowblower that will briefly start up than stall repeatedly.

I will use primer and will start again for a few seconds then die out like it is not getting gas to carb