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Justin Case Auto
Basically when you put your key in the ignition and turn it it tells the theft module that it is the right key and it is ok to start. If the theft module does not get the correct signal it will think the vehicle is being stolen and will not start. First thing to make sure is... did you try a spare key you have. I'm sure the repair shop already asked you about this but sometimes the key just goes bad.
Most likely a brake caliper hanging up and keeping the brake applied. Depending on how hot it got, and it sounds like it got hot, we would recommend calipers, hoses, pads, and possibly rotors.
This system has a fly by wire throttle system and the Kia's do have some issues with them. Take it back to who repaired the accelerator pedal sensor and I'm sure they'll retest it. It may be another part in the system or you may have just got a bad sensor, it happens.
Have someone hold open the throttle and clean inside the throttle body with some throttle cleaner and a tooth brush. reassemble, start vehicle and let idle for around 5 min. Drive vehicle and see if it's now ok. For future reference you should always have a battery backup installed when disconnecting the battery. On this vehicle the idle learn is really all that is lost but on newer vehicles there is a lot of reinitializing that will need to happen after a battery disconnect, trans shift points, windows, & doors, come to mind at this point but I know there is more.
Have the system pressure tested to find out where the leak is and repair it
Have someone put it on a hoist and check for worn bushings in rear suspension or something bent.
You will need a scanner that will access the anti-lock brake and traction control computers in the vehicle. If you're going to get your own scanner make sure it will do this. Most "code readers" will only access federally mandated codes for emissions. I think your best bet is to find a quality independent who can diagnosis this. It will be less expensive in the long run.
Could be a starter but have the battery tested (in the vehicle) first. Test all connections at the battery and starter.
Check for a pinched wire on top the fuel tank. The harness may have got caught when reinstalling the fuel tank.
Something is draining the battery overnight. Close all doors and make sure there is no interior lights left on. Check glove box light. Check under hood light. If all are off then take it to a shop that has the equipment and diagrams to diagnose a draw on the battery could be almost anything.