You need a scanner to do a few things. Your PCM may be having problems.

I have a scanner and also replaced the ignition coil but the code still comes on after resetting I think I will give it to the GM dealership

What are the misfire counts on the scanner? If you don't have that PID you need a better scanner.

Yes. Cylinder 2 was max at 21. Cylinder 6 was max at 23. Cylinder 8 didn’t go over 5. All of the other cylinders were at 0. Keep in mind this was live action when car was idle. We changed the ignition coil but still had the same reading.

Do a running compression test.
Also, if that is fine see if you can get the PCM flashed.

I've seen P0300 on my Yukon (with no individual cylinder codes) when the fuel pump was getting weak and the pressure was marginally low.

What is the fuel pressure?

If fuel trims are high then yes to fuel pressure being low.

I agree with CC, if fuel pressure is getting low, this will cause P0300 typically at higher engine load. You probably won't see/feel any misfire at idle. Get it out on the road into its highest gear at a low RPM with the TCC locked up. Gently ease into the gas without the TCC unlocking. If you feel bucking/sputtering etc, then you are misfiring probably due to insufficient fuel pressure.

He'* says it'* counting misfires at idle. Likely not fuel pressure.

Knock sensors are sensitive enough to detect it, but the human butt dyno probably will not. Thus why I instructed the test as I did.