ok the plugs have been changed but its still doing the same. whats the next step to look at? the glow plug light comes on and goes of almost instantly , the car takes about 10 seconds to turn over before starting when the glow plug light comes back on for about 3 or 4 minutes before going out again. its worse in colder weather, turning over for longer but after the first start of the day itll start all day first turn of the key?