1st off the the problem you describe is a common fault with most corsa models. from what you say, the air flow meter may be on the way out- this would definetly be the cause of the car slowing and rev's dropping however you need to say if you can hear any 'pinking' sounds this would be most noticible on any hill as you apply power. try it then post back.
otherwise, if you say the car is losing power and it is not on a hill, it could be a coil pack problem as the engine is going into limp mode-a safe guard.
or, that light that comes on is just telling you its time for a service, some cars will reduce power to put the point across. check this out 2.
hope this helps:)
Posted on Friday 15th of October 2010Don't understand this? Ask a question