I am gettting a knocking noise at between 1000rpm and 1500rpm as i only notice it when i am pulling away and when the car has been sat still for a while eg over night, i also noticed earlier when there is a drain on the power eg air con at idle cold start. It is more noticalbe when pulling away especially in reverse. I thought it could be something loose so i have had a look and cant see anything, any suggestions???