I don't think these got big ole EGR valves, just a small little vacuum hose at the one end of the valve cover connected to the intake, and a biggie on the other side of the valve cover coming from the front of the intake, in front of the air cleaner. I don't think this would cause a big vacuum leak. At least not that big that it only runs at 2000 RPM. If I drop the RPM much under 2000 it dies. More sensor replacement fun tomorrow. We'll git'r done one way or ta udder.