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Ben!
You are dang right assuming theyare all connected.
And that is why it's not easy to fix over the internet.
Regardless of the type of EGR valve used if it is vacuum controlled it will not be able to operate with a clogged CAT (or muffler)because the engine is unable to produce enough vacuum.
How hard is it for you to disconnect the exhaust?(rust etc). Seriously that would be the easiest way to find out. By the way a stuck closed EGR valve will not effect drivability.
A stuck open EGR will only effect the way the engine runs (like crap) at low rpms. And that is actually one way to see if the EGR passage is clogged or not to open the valve (either manually on the old or command open with the scanner on newer) and if the engine dies from idle,all is good.
I'm just going by your simpthoms description.
Barna
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