help please! escort zetec
 

my dads escort 1.6 zetec has lost power! not that it had much in the first place! he had it serviced a month ago, really has no go in it at all now cant find any plugs unplugged its running hot but not using water and when you turn the car off there is what sounds like an air leak from a box which is inbetween the leads and the air filter its got water hoses going in and out.. any help much appreciated