i dont know if this is the right or wrong way or even good advice for you since i put my old one in the trash and just installed a new one but i took a hammer and tapped on the POS Navi valve a while on all sides (as best as a i could get to) then took some large channel locks and pulled up on it. It came out after a while and was caked with crap. Just keep after it, on and make sure you take the two bolts out first.
I use a 5# puller with 2 claws. Turn the EGR valve a little so the mounting ears have enough space to get under them. Its just a couple of "O" rings kicking your butt. They beat me down for an hour until I used the puller. HaHa I suppose anything you can find to bump it up would work. It really didn't require that much, just more than you can "Pull"
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