1st when driving around I sometimes feel like the idle control is playing with throttle as I drive and letting off gas feels like its rite there so Im going 18 let off gas and it kind of stays there till brake is apllied then will slowdown... car to me idles nice just that feeling like that idle control is moving while driving is that normal in park revs right up and then right down I here theres a special way to change out the bad batt the car relearn idle? it looks like it was just replaced before I got it should I do that procedure or not worry