2005 Dodge Ram HEMI bogging down/ sluggish accerelation?

Beast

New member
I've had my spark plugs changed, tuneup, and my throttle bodies cleaned. When I accelerate, it's sluggish for the first second from a dead stop. Also, if I'm traveling at low speed (30-40mph) at constant speed, it'll bog/rpm level randomly move up/down. One day, it killed on me completely as I was traveling near 40mph. I pulled over and it started right back up. Any suggestions on what might be wrong? Obviously, the $800 I spent at the dealership didn't solve the problem. I apologize for the lack of mechanical terminology.
 
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