2009 5.3 misfire issue

[48TLR]

Hello, I have been trying to fix an issue for some time now. I have a 2009 Silverado 5.3 that is experiencing a misfire issue in cylinder 4. I have replaced the coils, plugs, wires and injectors. I’m getting spark and the plug smells like gas when I pull it out but it just isn’t working. I did a compression test on it and it was good. I also did a leak down test and it held pressure with and issues. The rockers are moving like the others so I don’t believe it’s the lifters. Any ideas or thought on what to look for next would be greatly appreciated.

[asilverblazer]

New parts don't always = good parts. 

Try swapping each component from a good cylinder to the problem cylinder one at a time to see if the miss fire follows one of the parts. 

 

What brand parts?

 

How did you confirm you were getting spark - it may not be a 'good enough spark', or incorrect plug gap...

See this link:

https://www.denso.com/global/en/products-and-services/automotive-service-parts-and-accessories/plug/basic/spark/condition.html