Hello,
I have been driving my 1997 firebird ( automatic ) without too many problems until the end of last year when basically I had to have the spark plugs changed as well as the "wire sets". The reason why this had to be done was because the car was "hesitating" when I would accelerate. The work got done by the usual dealer I go to.
Since the replacement, the car is not having that issue anymore BUT the engine has very very poor performances when accelerating, specially when I'm around 2500 - 3000 RPM. I went back to the place and the guys told me there was nothing wrong with the car. I have been using the same type of fuel all the time ( before and after the part change ).
Any idea of what might be going on ?