All that Failed EGR valve, EGR solenoid faulty, Failed EGR pressure sensor and failed EGR vposition sensor may be telling you that is the EGR valve is faulty and not that it is loaded up with carbon. But I know you don't want to hear that as that EGR cost more than a can of carb clean and I don't blame ya!
If yoy have a multi meter, check out easyautodiagnostics.com, go to the GM section for your motor, chose test EGR and there should be an explanation on how to run some test on your EGR before you buy a new one.
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