AU3 probs - noise in rear end + fuel surge

[sneaky]

i've checked the board and can't find any answers to my problems so here goes, hopefully easy things to solve and fix... oh, the car is a 2002 AU3 SR auto 6. and it's silver if that helps

1. somewhere in the back end there is a squeaky noise. sounds like a brake dragging (but they aren't). it only happens on tight corners / intersections / round-a-bouts, and it seems to go away once 'warmed up'.. i don't know how much movement there should be in the back, but to me it seems as though something must be moving in the corners as the car is fine in a straight line. any thoughts? checked the brakes and the handbrake..

2. when trying to drop a quick u-turn the car seems to suffer from fuel surge, ie it completely cuts out for a second then comes back to life (not what i want when doing ubolts on the highway). the few times it has happened i've had the car on power mode (auto) and had 1/2 a tank of fuel.. any thoughts..

thanks
-tim
PS the problems aren't that huge to me, just a bit annoying... but i don't drive the car very much the wife says the squeak is annoying as she drives it everyday..