On mine, I add stabilizer/ethanol treatment to the gas at every fill up, I also fill the oil tank at each fill up. I check the spark-plugs and raves about every 4 times out. I keep a battery tender on when not in use.
As for your throttle cable bouncing, there is an adjustment on the control handle to tighten up the lever so it does not move as easily. You could try that and see if it stops the bounce.