I'm not surprised to hear that about the PCMs. That's what I'm starting to realize when everything else checks out good, that's the thing I can't really test easily. Luckily they aren't terribly expensive so I can try a different one and see how that one works.
I have two known GOOD PCM's now. The Dodge PCM's were about $100 in 2006 and thankfully haven't gone up in price much between then & now. You can find them for $150-200 now. I thought I was being funny when I had my VIN installed into one but then every time I used a scan tool it would think I still had a 4 cyl Jeep so it was a PITA to get the scan tool to diagnose the engine. So I ended up buying another one with the stock vin for the V-8 in it.
It would sure be nice if there was a sure fire way for us guys to diagnose the PCM. I know you can do test to eliminate everything else but IMO you're still wondering if it's the PCM. Glad to hear they aren't too expensive too.