So I have a 2000 Chevy blazer 4 door 4x4 4.3. I started it up and let it get to operating temp it then started to misfire I checked the codes and it said cyl #2 random misfire I revved the engine a few times and the miss went away only to come back after reving the engine again. I can make it stop and start by giving it a few revs I put new plugs wires dizzy cap and wheel thing in the dizzy. Any idea what's going on ?

 

probalby ont but once my truck had a loose plug and caused this. When cold it was fairly tight, no misfire, when warm it loosened up and started misfiring

 

Sounds like a loose or bad spark plug wire. I had the exact same problem earlier this year. Got a set of delco plug wires and no more misfire.