starting issues

I'd start simple and work my way up from there. Change your fuel filter first. Should be fairly simple to do....it's usually mounted on the frame under the coach and will take a couple of wrenches to unbolt/bolt the fuel line and replace it. Might also check/change air filter. If that doesn't work, then I'd suspect the fuel line itself and then the fuel pump. If none of them, you might have to look at the ECM...(electronic control module)....that controls the fuel injection. Could also be a bad engine temp sensor that tells the ECM to send more fuel while the engine is cold.