IAC Valve

Well this sucks my CEL came back on. Code 1506. I could not find a vacuum leak so I took the plunge and replaced the intake and IRMC gaskets. I also cleaned the IRMC plates (they were pretty filthy). I wanted to change the O-rings on the IRMC shaft but I couldn't get the screws loose on the blades. I also changed the valve cover gaskets and put in all new COP boots. Car idles between 800 and 900 RPM when warm but has a vibration to it. I'm on my third IAC valve. Any suggestions?
 

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