The code points to the Throttle Position Sensor (TPS). A bad TPS will cause shifting and acceleration issues.
This is usually caused by a bad connection with the TPS, broken harness, or a bad TPS (bad TPS is probably the most common).
I would start by unplugging and re-seating the harness connector to see if it's just a bad connection (do this with the vehicle off and the keys out of the ignition. Also inspect the wires in the harness near the TPS connector to make sure they are not broken.
From there you can either test the TPS as per the FSM (I recall you've been given the link before):
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If needed you will have to replace the TPS. If you do so, you will want to go through the re-learn process in the FSM.
Also check for excessive carbon build up in the Throttle Body. This can prevent the butterfly from actuating correctly. Be careful doing this as it is an electic TB. It should be disconnected for cleaning and ideally removed from the vehicle. If left connected there is the possibility of the TB actuator closing it on your fingers and some TB's are strong enough to cause pretty severe injury. (removal of the TB from the vehicle is best as it will also prevent the carbon from being flushed down into the intake/engine.
My son's Mitsubishi Outlander has had this code a few times over the last 10 years. The first was cracked wire harness insulation to the TPS causing shorts. The second was a bad TPS. The most recent was due to the Throttle Body. It ended up being too much carbon in his 18 year old TB that was preventing the TB butterfly from actuating properly. A quick removal and cleaning had him back up and running.
So, start with
1) wire inspection
2) re-seating the TPS connector (a little dielectric grease never hurts)
3) re-seating the connector to the TB actuator (If this seems to solve the issue short term, you likely need to clean the TB)
4) test the TPS as per the FSM. Replace and re-learn if bad.
5) Remove and clean the TB. Try to use electric TB cleaner or electrical component cleaner as it may come into contact with the electrical component of the actuator. Regular carb cleaner is not typically recommended for electronic TB.