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throttle issues

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I have 2001 focus se auto with the duel overhead cam. My issue is I bought it after it sat for 6 months and at first when you started it and let it run in park the rpm would start out at 2k and start rising. So I replace a vacuum line that was leaking the maf sensor and the spark plugs. It will know idle at 750 rpm but when you put it in gear the car starts speeding up by it self and when u hit the gas it feels like you have no power. But if you hit the brakes it stops and rpms drops then raises as soon as you take your foot off the brakes. What could be the issue? I'm completely lost