Scott and Dennis -

Thank you for the additional suggestions.

I didn't get to this yesterday because of other commitments. The symptoms
worsened on my ride home yesterday. To the point I selected an alternate
route home because I was barely able to keep it at 40mph.

I will test the fuel pressure and see if disconnecting the O2 sensor does
anything. The Temp II sensor is fairly new but I will mess with that and
check the grounds at the engine while I am at it.

I do have another fuel pump I can swap in and will pout a new fuel filter
in as well. I also have access to an AFM I can try as well.

Dennis - it is definitely and "under load" situation as it starts and idles
perfectly fine. No backfiring (yet).

Thanks,

Jeff
'85 GL (Gertie)
'78 Bus (Melissa) Patty's Bus