1996 Holden Commodore • 25,000 miles

I own a 96 vs commodore I had a service and a tune up done two weeks ago because it felt like it was loosing power I got my car back and it seemed fine until christmas day I was driving and all of a sudden it lost power and felt like my transmission was going to break if I drove normal (just cruised) it would run extremly rough but if I put my foot down it would still kick back and get me up the slight hill.
I know a little bit about cars like the basics but I am stuck to wether it is my transmission or just spark or fuel because there is no warning lights on dash I cleaned out near the accelerator cable and it didnt do anything any ideas please
Elise vs96
January 3, 2013.

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