2004 Pontiac Grand Prix 2004 Pontiac Grand Prix GTP Engine

My 04 Pontiac Grand Prix GTP Supercharge is having engine trouble, so I think! Drove to Virginia from Indiana about a 10 hr. Drive, well in VA. There was a lot of mountains where cruise control would turn off on it's own(which no longer works), then would heat up. Now when I turn on the car the motor shake alot and sound as if it wants to turn off with a funny smell from muffler and when accelerating on gas it putters alot, then braking will try to turn off. Can someone help me with these issues?

P.S. I did disconnet the negative wire from battery for about 6 to 7 hrs, still same results.