1994 Pontiac Bonneville. Not supercharged. Car is shutting off while i'm driving, usually while idled low and i'm slowing to turn or stop. Doesn't sputter or stall, just turns off. Usually restarts right away but a couple times it had to sit to restart. Has done is when I first started driving and after driving for a while. Once the RPMs started jumping around and it attempted to die. Put new battery on and had the crank position sensor changed. 300 dollars later, it's still shutting off on me. Think there is a bearing loose in alternator because it makes a rattling noise. Not sure if that can do it.