Re: 1998 Ford 4.2L V6 idle issue

Ok did a little more research and youtube viewing.
Apparently the codes point to (2) IMRC valves and if they are bad
you can see idling and fuel economy issues...so that may explain my drop in idle
I noticed, and it does seem at times I get poor gas mileage on occasion.
The RT IMRC is Part No. F65Z-9S514-CC, F65Z-9S514-CB
Cannot find the PN for the LT side, but an ebay seller told me the OEM
Ford valves will almost always have dry rotted diaphrams and are junk
and ought not be purchased...and to go with aftermarket.
In one of the youtube videos, they claim you will hear a clicking sort of sound near the intake
manifold if these are bad, so that may explain the noise I made not of in the other post.
Another video claimed replacing the Vacuum Solenoid Purge Valve , PN: F65Z-9H465-CA /
F65E-9H465-CA solved the 2 error codes so I am thinking about buying this one on ebay:
https://www.ebay.com/itm/364159939529
With 100K on the eng, maybe its worth replacing anyhow?
I guess also a good idea to look at the vacuum lines behind the battery like the other
webpost mentioned in the event its a leaky line.
The Truck was at this used car dealer 12 yrs, mostly sitting waiting to be sold, he ran it every now and then
for short trips to Home Depot to pick up large items as its got the 8 foot bed, so maybe those diaphrams
did dry rot or crack in there?