Thread: 1999 Grand Prix GTP DTC P0303

Well you didnt buy the correct plugs.

Platinums and champions dont work well with these car.

It may be okay for now, but in a while you'll be back to the original problem because the waste spark ignition system will eat away at the plugs.

Ac Delco Iridiums are the best.

Originally Posted by Fivefingerdeathpunch

It may be okay for now, but in a while you'll be back to the original problem because the waste spark ignition system will eat away at the plugs.

Champions work best in Chryslers, motorcrafts work best in fords and Ac Delco work best in GM cars.

Iridium plugs are made for the gm cars. Platinums are just cheap plugs that burn out with our ignition system.