1999 saab 9 3 loss of power going up hill and when accelerating, have had the catalytic converter replaced, the turbo thingy checked and blown out, the muffler checked and found no problem, please HELP It has been put on the machine at 2 different dealers and no problem found
The first step with an engine performance problem is to run a compression test and make sure there are no mechanical faults. (As in worn engine.)
The car is 12 years old and you have not provided any details about mileage, history of the car, whether bought new or used, etc, etc.
I would also add that with many mechanics, both independent and dealer, do not perform that first step. They assume things and assumptions can often turn out to be wrong.