Just had my cambelt changed along with new pump and tensioner, sine then its makes a horrible noise when i rev it then let off the throttle, i took it to renault and they said maybe the timings out and the belts 1 or 2 teeth in the wrong place, its runs ok just makes this noise what do you think??? was fine before i had it changed. the noise isnt coming from the belt area but the rocker cover area. its a 1.2 16v 2003. thanks