My truck smell like death

[AZ Pete]

OK pauljboudreau, what did you find??

 

[pauljboudreau]

Did not find anything yet, smell seem to have gone down, nothing under ,nothing in the hood, and only two fly in the cab air filter

 

[geekyadam]

Did not find anything yet, smell seem to have gone down, nothing under ,nothing in the hood, and only two fly in the cab air filter

Just by chance, is it a manual transmission?

 

[Arizona]

I had that happen to my 2016, I put out a nice detailed segment.