I have a very similar problem as this guy.
https://www.fordforum.com/forum/ford...ne-bank-29005/

Mine throws errors codes P0356 - P0360

It looks like in all the cases of an entire bank failing at once the PCM was the culprit. Since this is a Motor Home nobody in the surrounding area is willing work on it.

I thought the best thing I could do would be just replace the PCM and see if it fixes it before I go to the effort to find a place that will work on motorhomes.

So... I see new and used PCMs all over eBay but none seem to be programmed. I recently bought a PCM for my Chevy and they asked for my VIN and it was programmed on arrival, I didn't see any Ford ones like that on eBay.

Can someone enlighten me on a good place to buy the PCM (I realize eBay probably isn't the best place) and secondly what do I need to do to get it programed?

Oh yeah, and where is it located on the vehicle?

Sorry for being so newb, but I'm not traditionally a Ford guy and I haven't had this very long.

 

I did find this place... thoughts?

1998 Ford Van (E-Series) 6.8L - PCM ECM ECU Engine Computer | Flagship One

 

Just as a follow-up, the weather got nice and I need to get my motorhome running. I ended up buying a PCM from the company I linked above and it fixed my problem.

Hopefully something didn't cause the PCM to fail (chaffed wire or similar) and I am good to go.

 

Somehow I missed your prior posts,, glad you got your MH up and running and thanks for the update..