I have owned my Nissan Almera 2.2 Di S for about eight weeks now, and it's run with no problems. After returning from a week's holiday I am having real problems getting the car started. I wait for the glow light to go out and turn it over, when it seems to try and and fire up, then dies. After a lot of attempts it finally starts and a good rev clears out white smoke. It happens when it has been stood for a while and the engine is cold - is this the glow plugs, or something more serious? It runs fine and doesn't stall at all when started, but as soon as it's cold it takes ages to get going.