Ok so my 02 n/a 40th grand prix is giving me some issues. First off it just recently turned over to 100,000 miles. I have noticed that the car is very slugish at WOT and i think i may have heard it back fire once but im not to sure. The other thing is that if i WOT the car it will hold the gear for a bit and then i think it is going to shift but sometimes it will hold it longer than i thought it was going to. Just so you guys know i bought this car off of my nana so she took it to the dealer regularly and never beat on it. She was the only ownerAlso i have kept up with regular oil changes and use full synthetic. My first though is it could be a clogged CAT which would be an easy fix cause im putting SD headers on with the included race pipe. But other than that im out of ideas. If it helps my mods are cone intake on TB and dynomax mufflers. Headers aren't installed yet
