The exhaust gas recirculation is meant to reduce NOx emissions but it also screws with your engine tune and idle. Deleting the EGR system will only improve on engine response and is an added bonus when you install a Weber. While everything is apart tidy up the inside of your inlet manifold with a flap sander drum on the end of a power drill. Give the walls of the inlet runners a buzz to smooth them out. It will aid the air/fuel charge flow.