2005 Silverado 4.8 noid light on solid

I have a 2005 Silverado 4.8 I recently bought, and it has a mis on cyl 7. Replaced plugs, wires, and coil on cyl 7. Still miss's, checked spark with a spark tester, have a good spark on cyl 7, used a noid light on cyl 7, and it's on solid with engine running

if noid light is staying on while running that is a issue with the ecm