hello all, ive recently bought my first 3l and have been playing abit with her. i noticed the idle was high (about a grand) so i wound it back to 750 and it has a nasty rattle. its leaking slightly, we did the old listen with a screwdriver and it was much louder on one of the injectors, so im hoping that its that. will it do any damage and can it be easily fixed? many thanks, jack