In the past, when I encountered a paragraph or a scene that didn't flow, I could tell there was room for improvement, but I wasn't always sure how to fix it. As long as it was close to grammatically correct, I let it slide, especially if I was on a deadline.
Now I stop. I ask myself what I want to achieve in that portion of the story and then rewrite toward that goal or I cut it.
This method takes longer sometimes, but I can tell already that it has made a difference.
Some iffy paragraphs have been vastly improved.