it started off like a tappet had dryed this was at lunch time today, so comeing home after work still sounded like the tappet so, going a long as i came on to boost it cough and back fire and then there was a very loud tapping sound, and it felt like there was something thumping, pulled over engine was still running but there was these noise's turn it off and call the AA anyone have clue i know its going to be something big cheers in avance