I had an EGR trouble code, the EGR system appeared to be blocked and after doing some digging found a plate on top of the intake that revealed part of the EGR passageway that was blocked with carbon deposits. Easy fix but could find no info in the shop manual or on this site that mentioned it. I can't even do a search if a search word contains less than 4 letters; such as EGR. How do I get around that?