Replace all four spark plugs, swap the #1 and #2 coils and then have the codes cleared.
If the misfire disappears completely, you are set. If it moves to the cylinder #2, then maybe you have a bad coil. If it stays on cylinder #1, then you have another problem.
Next, you need to replace the crankshaft position sensor, this could also be causing the misfire. Replace it, clear the codes and see if they come back.
It might be a good idea to buy your own code scanner so that you can read and clear codes yourself. Something like this: https://www.amazon.com/Autel-AutoLink-AL319-Scanner-Automotive/dp/B007XE8C74/
The Dodge Caliber is a cheap and poorly made car (by today's standards). Transmission, rust and electrical issues are a plague on most Caliber owners.
Even in good condition, most Dodge Calibers are only worth a two or three thousand dollars.
If you can get your Caliber going for $500 or so, then it is probably worth doing. If you are going to spend much more than that, I'd start thinking about another car.
