03 Century 3100 - P0401 Code

[Burg91]

I am currently having issues with a p0401 code. This being after changing the egr vamve, changing vacuum hoses (intake vacuum hose, pcv hise as well), and smoke testing for leaks. It eventually leads to a cylinder 1 misfire. I did utilize a metal wire to clean out the passge from the egr to the throttle body - but, when I utilized a borroscope, it did still look a little crudy in there. I also wonder, behind the throttle boddy, there is a lot of black soot located there, there is a circular portion there that is the passage to the egr, does this have a small hole that leads to the egr passage, or a screen of some sort, or does it need to be completely clear? If so, this MAY be why, I cleared a small hole as the rest appeared to be hardened and I didn't want to break anything. 

 

Thanks for the assistance.