Mazda tribute p402 egr flow excessive

Ok so I changed a exaust manifold on a 2002 Mazda tribute and now it won't IDle right the needle on the rpm gauge just bounces. So I changed the vacuum line because one had a hole, changed the EGR valve, and the DPFE sensor and it worked for a little bit but now it's doing it again please help

Do a smoke test, it will pinpoint it any air leaks around the pcv,egr, and air intake systems.