The uneven cuts could be a lot of things...
Blades out of balance, deck out of balance, tires with lower pressure on one side over the other, or even a bent/worn spindle. Even the belts slipping/catching can have some effect.
The intermittent start and stop of the blades could be the belts.
Not familiar with the Craftsman... but long ago the blades were engaged with a clutch. Basically a plunger attached near the steering wheel on the dash. Mowers of that ilk could see their cables have problems over time. It could be either stretched or sticking, or just simply out of adjustment.
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