[ Maintenance & Repairs ] Open Question : Acceleration problem? Maybe?

I just bought a 2003 Mitsubishi eclipse GT and I have noticed when I am in gear any of them, I keep the speed steady and then when I accelerate it the rpms throw up and then drop before actually accelerating. The acceleration is still good but I don't know why it would do this. I am new to manual drive vehicles and don't know if this is common.

Source: http://answers.yahoo.com/question/index?qid=20110404095954AAX2LqK

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