Why does my car not exhilarating much and makes a jerky putt putt sound.

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My car does not exhilarating much and makes a jerky putt putt sound. I replaced the spark plugs and leads now goes a little faster, but still does not exhilarate as it should and still makes the makes a jerky putt putt sound. I have a stick shift car and need to put it in 1st gear to go up a hill.