Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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It wasn't the valve but it is the parts being clogged. Take off the valve and clear out the holes going to it. Use wire and you will see that the one going to the intake is blocked with carbon. See it all the time.
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Go over it again and be sure to replace the throttle body gasket if you took the throttle apart and make sure you have no vacuum leaks. Then clear the codes and see what comes back.
Ok, at this point you need a better scan tool hooked up to be sure the computer is able to open the valve. YOur scanner cant do that. Theres a chance that the computer is not powering up the valve when it should be. New Valve and clean ports point to a bad computer. Have it tested first. Dont replace anything else. Handle the 170 after you clear the EGR code...