I have a 1996 Nissan Maxima. For some reason it shuts down on me, usually when I am at a red light. It starts right back up. I have had the fuel pump changed, the gas filter, the spark plugs & the knock sensor, which I thought was the original problem. I still have no idea why this is happening. It's been going on about 3 weeks now, and it ran fine without shutting off 1 day out of the whole 3 weeks. What can cause this? I am at my wits end.