If this only happens going up an hill then I would think the oil level is low.
The only thing in an engine that knows you are on a hill is the oil as it moves back and forward in the oil pan. With that being the case, we need to start with checking the oil level and I would suggest adding oil until it is at the top of the full mark. Don't just put it in the proper range, we need to put it at the highest possible safe mark.
Here is a guide that in step 8 it covers how to check the oil. Let us know what you find. Thanks
https://www.2carpros.com/articles/how-to-change-engine-oil-and-filter
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Friday, June 26th, 2020 AT 7:49 AM