SixguN

I was throwing a cel 12,36,41. The 36, and 41 are fixed. I searched on the code 12,( EGR - exhaust gas recirculation lift valve ) and the only advice I found was to clean the egr out with carb cleaner. Is there anything else that could have went wrong with the egr that is making me throw this code, besides being clogged? I tried to suck throught the vaccum line. I couldn't get any air to come threw, so I hope this is it. Any other ideas?