I have an 04 5.7 Hemi that is giving hard time. Right now after changing spark plugs and cables, EGR, camshaft sensor, TB and Map sensor is starting but dies quick. I took the oil cap off and now stays on with a rough idle (like no power) and if I put the oil cap back it will die quick. Was told it could be the PCV valve. Any other suggestions??

 

Possible. Take it out, clean it and see what you get. Kinda sounds like fuel delivery, too.

 

Was going to say EGR (that's what mine did), but you seem to have already taken care of that one.