OK so I recently replaced my injectors. the truck had a shake around 1500-1800 rpms. I assumed that had to do with the relays being bad on the inside of the valve covers, which I had planned to change but the parts store sent the wrong ones they had no wiring. So i buttoned it up and drove back to school, and waited for the new ones to arrive. Well the other day while just putting into town for food the truck began to knock. I looked in my mirror, and seen a very large cloud of gray smoke. So I had my buddy tow me home, and waited on the gaskets when they arrived I put them in, and it started, and didn't knock but it still smoked. I brought it up to 1200 rpm smoke cleaned up a bit. When i let out it came back and so did the knock again.

Any ideas? I need to get it running quickly.