I see no one replied to you yet. There's one thing you need to consider before you get too "wrapped around the axle". The things that shot out to me are "just bought" and "dealer's lot". Those are two comments often related to a vehicle that had the battery disconnected or run dead. The dealer could have installed a new battery, or, thanks to all of the many computers with their memory circuits, Chrysler says a good, fully-charged battery will be strong enough to start the engine after sitting for three weeks. That is now the industry standard. If your truck sat for two or three months, it likely needed a jump-start.
Anything that removes the 12 volts to the Engine Computer will cause it to lose its memory. All of the fuel trim numbers and much of the other learned data will begin to be rebuilt as soon as you start the engine, ... Except for "minimum throttle". Until that is relearned, the engine may not start unless you hold the accelerator pedal down 1/4", you won't get the nice idle flare-up to 1500 rpm at start-up, and it will tend to stall at stop signs. The Engine Computer will not know when it must be in control of idle speed until minimum throttle is relearned.
To meet the conditions for minimum throttle to be relearned, ... (I hope you're up for this!), ... Drive at highway speed with the engine warmed up, then coast for at least seven seconds without touching the pedals.
There may be other issues we'll need to consider, but this is one that should be addressed first.
Monday, May 1st, 2017 AT 3:56 PM