Neither. Deff not valves, checked them the other day. I think. It doesn't have its uber spark plug in it right now, it has the one for an 04 (different #'s)
The 05 uses a hotter plug.
I think
or maybe its just that its never liked starting in <50* weather.....
Ditch the 4 skin and get the smoker, they fire up hot or cold one kick.......come on ya know ya wanna do it.....do it.