wont stay running...again

ok so i check for vac leaks and the carb was super loose, i tightened it but still having the problem also plugged a vac line that wasnt in use. im gonna go buy a new pcv valve on a hunch but it may not be that. the carb is getting gas fine and i can see in the filter that its not dirty. was thinking it could be the float? could the gaps on plugs or old wires cause this problem? any help appreciated.

would i use a voltmeter to check the coil?

anybody got a cheap 1920? lol

should also note that i rebuilt the carb last season and then after playong with the timing it was running fine. ive tried timing it now, that didnt help