Not to insult your intelligence but going from a front wheel drive to a rear wheel drive, steering response is like night and day IMO. I experience that weird feeling also after driving my wifes front drive. My fuel pump changes tone frequently, it is usually loud at start up until it reaches normal temp. As far as the motor rocking check the motor mounts (just broke 3 of them on my wave runner, I had never checked them in the 3 yrs I owned the thing).