Car shakes when giving gas at a low rpm.

What is your question?

My 2012 Nissan Sentra will shack no matter the speed I'm going when its between 1000 and 2000 rpm. Just changed the spark plugs and added oil. What could be the reason for it shaking. The code for the check engine light was a misfire. I don't know what it could be.

What makes this problem better or worse?

Worse when at 1.5 rpm and pressing the gas. Gets better when more gas is given.

How long has your 2012 Nissan Sentra had this problem?

About a week.