Hey my name is Daniel and i own a vl commodore EFI rb30 i pickd it up 2 weeks ago and i am having some problems and make me not want to drive it and i need to for work.I took it in to be serviced last week and they balanced my weels,injector cleaner,sump washer new oil filter and the following needs to be done Air conditioner belt (Missing) , left hand steering rack boot split, and requires timing belt next service .It hass extractors sports exhust aswell well this is what happens when i reach 80km/h it seems to change into gear then starts not so much shaking but rattling but if i put the power button on it stops and it only does it if i accelorate and only does it sometimes any ideas?