2009 Dodge Ram 1500 5.7 Hemi

sounds like the fuel pump or a clogged cat...is the check engine soon light on? Can you check the fuel pressure yourself?

Yes, fuel pump,filter, and possibly cats.

I'm guessin' you're trying to avoid a repair shop like the plague?!? Like all of us, either principle, mistrust or simple lack of money motivates your visit to this sight. If the money light is on, get it read somehow. Borrow a code reader...OR...you can buy one of the orphan annie decoders CHEAP from walmart or amazon, they start round 10-15 bucks, depending upon your level of desire for surveillance n diagnosis. They won't tell you exactly whats wrong necessarily, but they'll point you in the right direction. Many times, the fuel trims will tell you lots about your problem, so if you decide to go down the path of the dark side or you're already there, make sure you get or got a code reader that also moonlights with live data streaming. Unfortunately, the fuel trims are useless if the engine won't run, but this should get you started.