Hi all. I have an issue with the manual shifting on my 05 crossfire coupe. It will run fine as long as it wants then, with no warning, it will act as if its downshifting ..or like someone stepped on the brakes as shifting takes place. Again, it will shift, then suddenly "pull back" for a few seconds. Then it goes back to fine. On the highway, in high gear, it will continue the "slowing down" process till it's not going fast at all. I'll pull over, wait and restart, and it's like nothing happened. Checked pressure , emission, and connections, and can't find a thing. What do you all think could be the cause?