Car vibrates when accelerating from 0-35

What is your question?

I can feel something vibrate when I accelerate at low speeds. It also sounds like it's running harder when it does that. Also when I leave the car off for 3+ house and then start it, it gets a little loud with an occasional taping sound for 30 seconds. I'd like to assume this second problem is related to the first one.

How long has your 2008 Nissan Altima had this problem?

About 4 months