Check engine light

Hello, This is a well documented problem, but there are several issues that may cause the problem. I do not advise changing any more coils, as P0300 indicates random misfires across multiple cylinders, and the other two codes suggest there is too much fuel in the air/fuel mixture. This may or may not be the case, as the computer can only report to you (via check engine light) what it is being told. Here is a help page for these codes, for further information, and check the second link for general diagnostics estimates at certified shops in your area: https://repairpal.com/OBD-II-Code-P0172-and-P0175 Estimate: https://repairpal.com/estimator/gmc/yukon+xl+1500