Just a small question. Is your gearbox misbehaving too?
Mine's been fucky for quite a while. It's not properly entering first gear, even if the car is standing still and sometimes would resist entering third aswell. Worst I got with it was when it wasn't entering in any gear and the gearshifter actually went flaccid. The mechanic fixed it right away, and it worked fine for about 2-3 days and started misbehaving again.
I've been told before about the joy of GM gearboxes, but now I'm unsure if it's faulty from built or is it just my car that has a problem.