When I started my freestyle this morning it felt like it was running rough. Then when I started driving it was sluggishly accelerating and running rougher. I pulled the code p0354. When I google the code I did see that a manifold leak could cause it. So when I looked over the hoses I did notice what look like a vacuum hose just sitting there not connected to anything. I will try and post a picture of it. Also just yesterday I drove it and while it did seem like it was running a little bad but not nearly as bad as today. Also I ran it down to about 30 miles to empty and put gas in it about 5 to 10 miles from home but it was driven again afterwards and not running as rough. So I was sorta of wondering if it could have been bad gas. Any help would be great.