my last injector on the right side ( the driver side lookin under the hood ) is makin a buzzing noise ever few mins its like on the rail or something there is a plastic piece and there is a wire that comes out from the injector and i felt it and it is like shakin and buzzin a lil it can get pretty loud . is it normal or do u think i can use new injectors - PS i also put in fuel injector cleaner when i got the car to help them out and it still does it . thanks for ur help , - JASON-