Old gas from around Nov of last year. It was premium, tried to get an old car started and it wouldn't. (bad fuel pump)?

Been using it for the lawn mower this year.

Starts sluggish. Should I add fresh gas & mix it or buy a stabilizer or something? Or dump it? It just takes 3-4 minutes to warm up. The entire time it sounds like its going to die so I tilt it up for a few seconds..
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