88 Suburban V10 EGR removal for an idle misfire

[Mr. M3]

So to start the previous owner of my Suburban replaced the exhaust from the manifolds back. Recently I have noticed an inconsistent misfire when idling and it has been suggested that the old EGR is a possible cause, as all cylinders have spark, plugs are new, and the ignition module tests good at the part store, I installed a new cap/rotor and timing is good. So I figure I will remove the EGR and plate it. The big item that I am unsure of is all the plumbing coming off the manifolds. Can I just plug the ports on the manifolds and cut out the old plumbing? This is the youngest Chevy I have owned and the only TBI I have owned. What suggestions can you guys give me to correct this misfire?