Answer to "What acceleration on the mouse means?"Think of it as the viewing sensitivity in a game. Increase the acceleration, you increase the sensitivity of your mouse to get from point "a" to point "b" on your computer, question is How much acceleration can you handle?
Answer to "Idling problems while driving or parking"It could be your TPS (Throttle Position Sensor), MAF, or even a leak in your Intake Manifold (maybe a lose or broken hose to a cracked manifold), check to see if the MAF sensor is dirty or has too much oil on it. Do as Osvaldo said, get your codes read at AutoZone, Hey its free!