When you cleaned it, did you soak it in carb cleaner and move the plunger (pintle) in and out repeatedly? When I install the SCs, I place the EGR upside down and let the carb cleaner soak in. Did you clean the EGR tube that feeds into the intake manifold? This clogs easily. Remove the throttlebody and look into the intake and you will see the ~3/8" tube that comes from the valve itself. You can clean with a long pipe or aquarium brush and carb cleaner.
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