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You really do need to vac test to know what the deal is.  But a vac leak, unless massive, is gonna cause idle issues and not running issues (in general).


The intake boots on the saws are tough as nails.  Never seen one torn, but if the AV mounts are bad, it’s possible.


Personally, I’d toss the 194 back on, set the screws to 1/1, and fire the saw with some fuel down the carb bore. Then run with the AF cover slipped on and no air filter.


Also, check that your spark screen isn’t gummed up with carbon.  Clean with a propane torch if it is.


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