Wont run 50 miles per hour

What is your question?

Blows black smoke from exhaust on drivers side start it up runs fine, after a minute idles down very low and turns to rough idle and it throws a random misfire code

What makes this problem better or worse?

My throwing parts at it

How long has your 2004 Chevrolet Silverado 2500 had this problem?

I have been trying to figure out what it is