What causes sputtering on 2009 Chevrolet Traverse

my 2009 started to sputter two weeks ago. I thought it was bad gas but soon realized it was not.

It is worst between 1.5 - 2.5 RPM's.

What causes this?

Asked by for the 2009 Chevrolet Traverse
1 answer
possibly a crossfire in the ignition system. do you have a ck eng like on?