Hello, I have been having the same problem with my 05 GP GT since I bought it 3 years ago and would like some help. Every once in awhile (around every 15-20 start-ups) the engine will idle fine but when I start to go it feels like the engine lacks power, at speeds of 20+ it will feel like it is missing (shuddering\jerking in the engine). Their is also a noticeable drop in the estimated MPG on my info screen but their has never been a check engine light that has come on at all. However, if I pull over and turn the car off and start it back up the problem vanishes. I have talked to 2 of my customers (I work at a bank) who are mechanics and they both have said it is most likely a sticking EGR valve or a coil pack that is fixing to go bad. I would just like a 3rd opinion before I drop it off to be fixed please.