My 4.3 has a miss

[corn]

My truck had been sitting for a month or so while I was working on it. Id start it & move it around but didnt drive it much. After I got it going I noticed it had a slight miss that would seem to go away after it warmed up. The other night after I had all the painting done I wanted to go cruise around but the miss wouldnt go away. I went & put some gas in it & drove it out a few miles & back but it was still there. Its been forever that its been tuned so I put in a new set of plugs & wires but still missing. Any Ideas? Almost sounds like vacuum but Im not sure. Tomorrow Ill run the code scanner to see if its throwing any codes. It ran perfect before I changed the headlites to composite & painted the truck. The only other thing I changed was the bed (new filler hose too). Hope I dont have an intake leak! I really want to drive this beast!