My dad has his cam belt replaced last night (from a man recomended by my uncle not a garage which I kept telling him to use to go instead of an unkown machnanic) any it was fine last night driving back but now the car is ideling and the engine is racing. I am fearing the cambelt may to to tight and could snap, or is it normal to put the camblet on tightly as it will work looser after a few days?