I'm sure it's something simple. First, I attached a pic below that shows the possible causes of the P2111. That is the stuck code you indicated. The other code is to indicate the vehicle is in a "fixed idle" mode.
Now the throttle body is on the intake. If you follow the air intake tube from the air filter box, it will lead you to the throttle body (TB). Since this just happened, check the following:
1) Did you disconnect the electrical plug in pic 2 (circled)?
2) Make sure that connector is tight and not damaged.
3) I have an arrow titled TP which stands for throttle plate. Look at the TP and make sure nothing is preventing it from closing.
Since this happened after the work was done, I suspect a wire is disconnected, pinched, or something is preventing the TP from fully closing.
Let me know what you find.
Images (Click to enlarge)
Wednesday, May 20th, 2020 AT 8:57 PM