sooo...i'm trying to figure out if i'm freaking out because my car is still new to me or if it really may have a problem. i feel as though the car's rear-end shudders very slightly in 2500rpm rev range at light load. under hard acceleration i get the occasional wheel hop, but i'm talking about slow acceleration. does anyone else have experience with this? also, i feel my car runs too rich. anytime i floor the car, you see little clouds of smoke. when you start it, you can see smoke till it warms up. it's not blue, so i'm pretty sure if it's anything abnormal, it's just that i'm running rich. any knowledge and/or advice is greatly appreciated. oh yeah, the car is cpo'd through 2/11/08, but i just want to know what's up so i can explain it to the stealer.