[bowtiejack]

the egr , behind the tbi on the passenger side , has a baffle on the underside should flex in and out helping to modulate the idle. if it sticks or doesn't suck in and out, it will cause a rough idle but i believe it will flash the check engine lite as it is part of the emissions . to replace it, get the long model number off the original because there are alot of different versions thru out model years.