This may not be your problem, but I had similar issues with my 2005 GT, so I figured I'd pipe in, just so you have as much info as possible. When I would stop, my car would feel like it was just about to stall out, but then "catch" itself. It was a lot more noticable if I had the brakes applied. Also, when I would be crusing at highway speeds, (55-70ish) and I would accelrate (still being in 5th gear) it felt like I had no power at all. I'd have to drop to 4th, sometimes 3rd gear to get any power. Finally, after about 2 weeks of this, my Check Engine light came on. The report back from the dealer was, that I had two bad spark plugs and an ignition coil.
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Go Slow or Go Fast. I really don't care. Just GO! 
Year & Model:
2005 GT 5 Spd
Dyno Numbers:
Zero. Dynosaurs are extinct.
Quarter Mile Time:
It's 25% of the time it takes me to go a full mile.
Mods:
Installed:
SLP LoudMouths
Steeda Complete C.A.I. Kit
Motive 4.10 Gears
SCT X-Cal2 Tune (By American Muscle)
Sequential Taillights
Next:
Hurst Short Throw Shift Kit
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