Purge Valve Replacement?

DWCaprice2017

Not-quite-so-new-guy
Oct 25, 2019
41
16
8
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Hi, I'm Daniel with the '84 Caprice, 305, ccc q-jet:
I'm probably grabbing at thin air, but would a bad canister purge valve cause a rough (low) idle after the engine warms up?
I know to check the spark plugs and vac hoses, I'm trying to figure out what else might cause the roughness after about
10-minutes. Yeah...I know, a lot could!

No, I'm not getting a "Check Engine" light.

I found a couple of the tiny-opening hard plastic lines--very brittle, on the left (passenger side) of the engine, near the rear,
where do they start at? It looks like they're meant to be going to the same place.
 
A bad purge valve can cause idle issues, but so can bad PCV valve, brake booster, HVAC, oil pan gasket, etc. You need a Mityvac to test it and other vacuum parts for leaks.
 

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