The gasket under the fuel rail is called the intake manifold gaskets (O-rings). It's very common to have a vacuum leak there. Replace those O-rings and upper plenium also. the most likely complaint is, runs bad cold and once it warms up to operating engine temp it seems to run better.
ok thanks what about the egr valve I pull the vacum hose off of the egr valve it run smooth and when i hook it back up it run like nothing wrong if it have a burnth valve will it run smooth i hook the egr valve back up nit run like missing