No. From 1992 to 2008 (final model year), the Pontiac Grand Prix was a front-wheel drive vehicle. Prior to 1992, the Grand Prix was rear-wheel drive. The Grand Prix was never an all-wheel drive vehicle.
The camshaft position sensor on a 1998 Pontiac Grand Prix is located behind the rear bearing of the camshaft. It constantly monitors the rotation of the camshaft and relays this information to the computer.