I have a 94 Bonneville that seems to stall every once in awhile while I am driving. Once I pull over and start it again it starts right up and the car drives really good otherwise and even after it stalls and starts back up it runs fine. It does not appear to do it at any specific time during driving but it does seem like it stalls less when I have more than a half tank of gas in my car. Not sure if that is just coincidence or not. Any suggestions as to where I should start to try and correct this???