OK, here's a very WEIRD update on this topic.
After doing much of the on-off-on-off-on and getting the engine code of P0455, I did notice that if the van sat over time it would not start or was very hard starting. So, after the van sat for two days, I kept turning the key and the engine would diesel-like sputter and then stop. (I can't describe it any other way.) It would take about 20 mins to get the van to finally run.
Well, nearly two weeks of going out and starting the van every 12 hours like clock work to prevent this sputter problem, I had to go out of town for a few days. Coming back to start the van, I ran the old battery dead. So, I got a new one. The van sputtered for a good while and finally started. Every time I left the van unstarted for about a day, the sputtering problem returned. However, when I changed out the battery, the P0455 code went away. I would just get P-done displayed.
Finally, this past week, I had the jumper cables from the B1500 onto the new battery of the B2500 with this sputtering issue related to the P0455 code. I spent over 30 mins cranking and sputtering to no avail. My DW came out, turned off the B1500 and told me to stop wasting her gas. ! lol To make things even more troublesome it started to rain. I looked under the hood at that EVAP green cap to the right of the battery plate. That hose ran to a hard plastic tube up to the Throttle Body and under the air filter housing. Just for grins, I popped the rubber hose off of that line, jumped back into the van and turned the key. Guess what! it started and stayed running.
So, this EVAP emission thing really is wacky. As the engine was running with this hose line off, I went to check what the line was doing. The line from the TB was pulling a mightly amount of vaccum. I drove the van for about two blocks. The idle went from very bad to an OK I can deal with it. Of course, the funny little yellow engine light stayed on in the dash, but no codes would show up.
Here in New York state, we have vehicle safety and emission testing. I couldn't run the van like this. So, I put the hose back on and off to a good garage to find the P0455 problem (via a smoke/UV test) and solve the hard starting issue.
I got the van back this week. The garage ran a deep scan with a dealer level type of machine. The coil was bad. Nothing showed up on the EVAP at all. The van really purrs and the engine noise had really dropped greatly during idle and while running down the road. To test this out, I let the van sit over the weekend and it started right away with the first turn of the key.
As for the P0455 issue, it's gone. I'm not sure where it went. Did it correct itself when I pulled the hose from the line to blow something out? Did the new coil correct the problem due to proper electrical current? Was there another code deeper in the ECM that was making the van run bad? I'm not sure. I'm sure that the van runs like a vehicle now. It purrs better than when I bought it used!
So, the Ram Van saga continues ...