I have a 02 Chevy tahoe....it sounds like coolant rushing throughout the engine while sitting at an idle and about every 2 or 3 days I gotta add coolant its not much also the low coolant light comes on quite often

I would perform a coolant pressure test because these engines are known for leaking intake manifold gaskets.Check and see if your oil is starting to turn a creamy tan color.

My '02 Tahoe had a check engine light come on at 126k miles and dealer found it was the intake manifold gasket. They also changed the valley pan gasket since they were taking the manifold off. It was a few dollars more since they were already there. Turns out this did fix it plus it also fixed a minor oil problem. The 5.3 used about a quart of oil between oil changes and most shops claimed it was the oil pan gasket or a rear main seal. This engine has not used any oil since they changed both gaskets. It would probably be a good idea that if the intake manifold gasket is changed to go ahead and change the valley pan gasket underneath it. I think it was about $50 more to do both.