out of the blue the car would "buck" and hesitate slightly at around 50mph or higher. Then a week later the service engine soon light glowed. I went to autozone and pulled the code P0341 camshaft position sensor performance. OK what the hell does that mean? not being a master tech or anything i use common sense and buy a replacement CPS from autozone. I replaces the sensor and started the car and everything was fine until i got down the road and a half mile later the service engine soon light was on again. OH BOY! here we go instantly let down. this car only has 31,400 miles cmon these aren't supposed to happen yet. I mean yeah sensors go bad but then you change them then it should be fine. I jsut don't get how many years a company has to build a car to perfect the gasoline engine. How long does it take to get it right? I'm disappointed in Buick as all i'm reading on the interenet is bad things about a car that has a reliable (or DID) namesake. Now i will just sit here and wait for my windows to fall down and the power motors to break. I'm on my way to the mechanic to get my car and i think i'll take the vasoline with me.