Got some issues going on with my 04 GTP!!! I used to have issues with coolant leaking....fixed the notorious leaking elbows under the idler pulley assembly, but now it seems that I have a new problem. Since I did the repair, it seems that the temperature gauge never goes above the first "quarter" mark, it'll rise if I sit a light for a while, but then goes right back down as soon as i start driving, which causes the check engine light to come on. I just replaced the thermostat thinking that would help, which it didn't. Out of ideas, need some suggestions!!