I just recently gave my 03 gt a tune up i have a little over 37000 mi on the car and i was feeling hesitation at a dead stop a buddy of mine asked what is up with your car and i said ive got a miss well as it turns out my problem got worse...it got so bad and was missng so bad that is turned on the check engine light. I already knew what the problem was so i order plugs and wires from
www.sprakplugs.com part # ptset...i hooked up the scan tool and i had a miss on the #1 cyl. so my plugs and wires came in from cali and i got 4 NGK Iridium plugs and 4 9mm plug wires and the problem was solved but it was missing really bad.. The NGK plugs and the bigger wires are great better throttle response and it seems to pull harder at a higher rpm than before...so i can so im please with my purchase and it cost me around 80$ to do it myself.