Long time lurker, first time poster. I've got a 2004 Ram with the 5.7. At low cruising RPM's (1100-1500) I'm getting what feels like a hesitation, RPM's drop a few hundred, feels like you've hit the brakes or got completely off the gas. Only while driving at these RPM's. Idles smooth, no hesitation if I stomp on it, no hesitation with the cruise on or driving at highway speeds/RPM's. It will do it with the cruise on at the 1100-1500 RPM range going 35-45 mph. Feels kinda like the torque converter is locking and unlocking. No check engine lights. Any ideas before I start replacing/tearing up parts? Plugs are getting a little old, I'm praying it's not a transmission problem as it is in that RPM range where it feels like it might be wanting to down shift but then gives up. Thanks for any ideas.