I have a 2008 Chevy Impala 3.5 V6. The vehicle runs poorly and has lost power and stalled several time. Sometimes it starts right back up and other times it has taken 1 and 1/2 hours to get it to start. There has been some VERY close calls when it has stalled on the interstate. Replaced the Camshaft Positioning Sensor and had the fuel pressured checked and pressure was 63#. Vehicle still is doing it with no rhyme or reason to when and where it will happen. I believe it reading all the complaints of this same thing happening to others that there ought to be a way to file some kind o legal action against Chevrolet to force them into finding the problem and fixing it before someone is killed because of their negligence!