PO300 Diagnosing a Misfire- 2003 Chevy Silverado 5.3L

The truck would barely run, only code that came up was the PO300 Random Misfire
Here are the links I mentioned

Temp (heat) Gun. https://amzn.to/3dUiqQm
Injector set. https://amzn.to/3r07oN6
Manifold regulator. https://amzn.to/3bJO5kN
If you need the fuel pump here is the link. https://amzn.to/3kOqkfz

Видео PO300 Diagnosing a Misfire- 2003 Chevy Silverado 5.3L канала Fast Dad Garage - North & South Chamberlain’s