has any one had a rattling noise when ticking over. starts off noisy when cold, then has a tapping sort of sound when ticking over, also does it when revving to 2000rpm. the car was stood around for 8wks prior to me buying it, so i done an oil and filter change using genuine parts, and also done an engine flush, thinking it was a noisy tappet. was fine when bought it and drove home from leeds to devon but started about a week after. its a 2003 1.6 16v active sport with 30k.