2000 Chevy Tahoe Valve Job

A cylender with low compression is ususally felt regardless of engine speed. Did he tell you what the compression was for each cylender? Also, cold or hot, low compression is felt. I would recommend having the compression retested. It's not hard to do. Here is a how to for checking compression. The gauge can be purchased from this site, or some parts stores will rent them.

https://www.2carpros.com/dia/how_to_check_compression.htm

Let me know what you find. That way we can be sure if this is the problem. Also, keep in mind, this vehicle has low mileage; therefore, I really think we need to look at something else. That is my gut feeling.

Joe