The problem is back again.
It drove great for the last 3 weeks until this Sunday.
Same issue. Unplugged the EHA valve to make it to my destination. I replaced all of the vacuum line connectors and checked the odd shaped ones that I didn't have replacements for as well as the one at the transmission too. Plugged the EHA valve back in and it ran great again for about half a day.
I checked the vacuum line for the pressure regulator, the hose in the regulator it definitely needs to be replaced so I doubt that the suction is working well enough to operate what ever the mechanism is in the regulator.
If this is an issue with the regulator, I am unclear what the relation with the EHA valve is and how it will be "fixed" after small repairs only to act up again.
I am reading up on 124zone to hopefully gain some insight and figure it out.

anyone have any ideas to add?
thanks