Can anyone make a suggestion. I just purchased a Galaxy Mk2 W reg 2.3 Zetec for towing. Whilts the car seem fine on its own when I have the caravan on i dont seem to have much power and I am struggling to get to 60 and hold it, is fine at 55 when i excelerate the engine makes what i can only describe as a loud pinking / rattling, this goes if i back of the excelerator. Also I dont semm to be able to get more than 3500 revs? Car has just passed its mot with good gas readings, going to change the plugs, any other suggestions Also i have an Airbag warning up on the dash and not sure whta to read it with.