Have replaced both the valve body and module for my EGR . Check engine light still on. Guys at auto zone who checked the codes now say I need to replace tube running from base of valve body to exhaust manifold. They said it gets clogged up. When I looked at the pipe I cant see how it could clog, however I noticed the 2 tubes which ran from that pipe to the module. I disconnected the small rubber tubes and blew threw them , they are not clogged. Is it possible I HAVE BEEN SOLD DEFECTIVE PARTS ?? They said no return on the module already. Any way to see if new parts are working properly. This thing is sucking gas as if there was a hole in the tank. Any help appreciated