What got you in this shape? Bad crash or this just started happening spontaneously? Wobbly gear is either a bent shaft or bad or unseated bearing. When adjusting the servo arms, you need to have the TX/RX on. Remove the arm, Turn on the TX then RX and reinstall the arm at 90 degrees and check the throw with TX inputs. Readjust your connecting rods as necessary. Also check that the lower rotor head hasn't got shoved down or up and thrown your swash off. If you had a bad crash, it's possible that you stripped the servo gear. NOTE: I would remove the blades while messing with the TX/RX powered up, just in case

I've never heard an e-motor "sputter" before, but check the gears for stripped sections and check for binding. If all is OK then the motors may need replacing. If you need to replace them, then get the Extreme ball bearing motors. They'll last longer and the brushes are replaceable.