Engine wont rev over 3000rpm
 

Hi I was wondering if anyone an help, my father has a s80that is runningrough and wont rev above 3,000 rpm. We decided to have a guess at an air flow meter but this hasn't made any differance. Occaisionally the carwill fire up and run faultless so we are certain it is some sensor at fault somewhere but really don't have a clue as to what. Also the emmision service light is on.

RE: Engine wont rev over 3000rpm
 

Does the exhaust sound different when it happens?