my golf used to just ramdomly stall while driving and take a while to start up again. it been doing it for a few months, then i went away on holiday for 2 weeks so didnt drive my car, when i came back it started first time but shut off right away and i cannot start it again. i have just changed spark plugs, ignition coil and fuel filter. still wont start. it appears the plugs arent sparking. anyone have any ideas???