Hi, thanks for the replies, was more like a thud noise, had a friend pop round last night who knows a bit about engines and he was stumped as well, he described the engine as sounding very throaty (like a blown exhaust sound) and its is defiantly misfiring. He thinks its got to be either a slipped cam or timing belt. I am not sure if the cam belt has been changed as i have only had it 18 months or so, the irony is that it is booked in on Friday to have a service, MOT and cam belt change this week to be on the safe side or so i thought when i booked it lol. So assuming one of the belts has slipped what do you think my best plan of action is ? also how much out of my wedding fund have i just blown ?