I don't think these are related to the code but I attached info for the code below.
However, this issue sounds like a possible vacuum leak. Here is a guide that will help with this:
https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge
The shifting may be a separate issue so we need to tackle the engine running poor issue first and then we can go after the shifting issue if that is not solved as well.
Let me know what questions you have.
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Monday, March 1st, 2021 AT 3:10 PM