'93

'93 Ranger has a rough idle whether it's warmed up for cold start. It will shudder down to what sounds like 600rpm then it will kick back up and it will keep going back to the shaking and shuddering. I could change the plugs, wires, injector. What's wrong with it?

I need help identifying a replacement for this EGR Tube. It's fairly rotted with holes, so I don't think repairing/welding the old one will work well. '93 3.0L V6, 4WD, AT I "think" I found the Ford replacement part on their webpage, but none of the online parts diagrams match. Most of the...