Why won’t by expedition fire up? Turns over but has has a hard time starting.

What is your question?

Low on fuel, put some in, acted like bad gas. Filled up with a higher quality fuel, added fuel injection etc, backfires some, still having issues at times starting then dies if idles. Any thoughts? New battery. No noises. Doesn’t have the “get up and go” like it should.

What makes this problem better or worse?

Worse when cold outside

How long has your 2003 Ford Expedition had this problem?

A few days