I am trying to make some decals for my father in law, and I cannot for the life of me find this font, or one that is similar enough i can mod it. Please help?

Armstrong Italic  Suggested by donshottype 
Cartoleria  Suggested by donshottype 
Starliner Bold Oblique  Suggested by donshottype 
Rocket Script  Suggested by donshottype 

No single font has all the letters to match.
But there are some similar fonts that you might try alone or mix and match.
Armstrong Italic has a somewhat similar vibe.

HTCartoleria has a similar _E_
You would need to slope this one
Don

Starliner BTN Bold Oblique would have been my first choice as a substitute but is too light as is. If you can thicken it and make the _S_ narrower it could work fine.

Rocket Script is also too light as is. If you can thicken it and make the _S_ narrower it could work fine.