Pretty regular occurrence with these old motors hey Paulie. Definitely focus attention on the fuel system. Give it a good clean up.
These old motors can really give the patience a workout. Purring one day, spluttering and choking the next. Not to mention the stench of spent unleaded all over you after use. This is why mine end up on the shelf to collect dust in the shed. With a very 'laid back' intention of tearing down and attempting a refresh... some day.
When you're pretty time poor and just want to put these machines to work on the spot, new motor is the way to go (obviously budget permitting). Do it Paulie, you will love it.
