Idling rough loss of power fuel consumption

This could be a sensor issue, but long term is a calculation based on a number of inputs including short term, so let's start with what the short term is reading.

I am attaching a chart below that will help with determining if they are rich or lean.

So, I am going to assume we have a lean mixture which would mean a vacuum leak or low fuel pressure issue. So, let's start by checking the short term and if it is lean, use this guide to see if there is a vacuum leak:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Once we know this info, we will have a better idea which direction to go.

Thanks