Put knock sensors and headers and ory on my 04 Silverado today. After we put the knock sensors in I started the truck to make sure it run good after putting the intake back on and it was quiet and smooth. Put the headers and y pipe on with New gto plug wires. Started it and it run good and smooth for about 30 seconds and then got rough and comes up with multiple misfires. I took the plugs out while putting the headers on and made sure the wires were seated. Does it just need a tune. I left the back 02 sensors plugged up and just zip tied them up. Do I leave the or unplug them and take them off.

 

Perhaps a plug has a crack in it, kinda hard to say.

I would remove them again and check them out. And make sure all injector connectors are plugged in all the way and no pins got bent.

 

burn wire plug? happened to me before. what kind header are u using.

 

yep.....you always burn one....or you dropped a spark plug and its cracked

 

I'll grab a set of plugs and throw in it just incase and I'm using Pacesetters with gto plug wires. I do know it's not the plug wires