Join Date: Nov 2009
Location: Carnation, Washington, USA
Year: 1999, 1975
Model: GL1500SE GL1000
This would seem to be the key.
"Spring of 2018 I got her out of the garage, hit the starter and she sprang to life, ready to roll. I thought. We didn't get a mile from the house before it started to spit and sputter at almost any rpm."
I remember this situation in an old late 1990s Chevy Van.
When the coolant level went low would do the exact same thing. Fill the level and it ran fine.
Sounds like a sensor is going.
How would coolant level have anything to do with it?
Don't own a Vanagon.
Don't work at Boeing.
Life is good.
1999 GL1500 SE