My 960 Volvo would suddenly lose all power while I was driving. I would pull over, shut the iengine off, wait a few seconds, then restart the car and it would run fine for months. It did this several times and my mechanic finally replaced the fule pump. It ran fine for a year and then stalled on me again recently. I restarted it and nursed it for a few blocks before it stalled again. Eventually it would start up but immediately stall - it's like it's not getting fuel or a spark to the plugs. Any idea what the problem could be?