Patriot throttle bodies have been known to go bad and your symptoms sure seem similar to those discussed on the internet. Member Silverflash here had one replaced as did I (under warranty). I do not think the powertrain warranty covers this, but check with your dealer. IF you decide to let a dealer repair it, hit them hard with facts learned about this problem on the net and see if they will do a good will repair at reduced cost. A Google search finds two possible problems. There are internal gears that can shear under certain conditions and some have found excess oil in the TB (maybe bad PCV?).
OEM replacements can be had on the net for about $220 delivered. There are numerous You tube videos that show easy replacement from the top side. Search both Patriot and Caliber Throttle Body Replacement at You Tube and Google.
Good luck and keep us posted. I think dealers want $600+ for this service.
Regarding an ETC Relearn procedure, there are diy methods discussed on the net, but there is also controversy about whether this really works or is just a myth.
2014 Sport, 2wd, 2.4L, 6 speed tranny, Winter Chill
Last edited by Treegrower; 11-02-2016 at 09:16 PM.