Chevy Silverado GMC Sierra 4.8 LS Intermittent Cylinder Misfire - Diagnosis and Repair

Truck is a 2008 Silverado with a 4.8 LS V8. Truck was driving normal then started to misfire and lose power. Intermittently it would clear up. There was no engine warning light either. Here’s how I I isolated and corrected issue.

@BarnDustandRust

[hongchongtang]

I guess the parts inside the engine need to be replaced