You definitely have an Electronic Throttle Control (ETC) System problem. Other wise your ETC Light would not be coming on at all. The problem could be caused by several other systems, like your Traction/ABS Control, Transmission Control, Engine Control, a Data Bus Problem, a wiring problem etc. There is actually a TSB or technical Service Bulletin for this very problem written by Dodge. It is TSB number 18-034-07 for problems with the ETC and poor performance i.e. stalling etc, and code P2174. It is a Computer reprogram. Just because you don't have the exact code, I think that you should still have the computer(s) updated. The Dealership tries to do as little warranty work as possible, to keep the costs down for Dodge. Though I have worked at Dealerships, I never liked this policy, as it hurts the consumer. I would inquire about this, read this number off to the Service Writer and by all means start a repair history for this problem before your Warrant (3yr-36k ) runs out, so it will still be covered after the warranty period, just in case they drag their feet, as they often do.