I have had this happen twice - in two different engines. Once my fault -
once the fault of the quickie oil change place I don't ever go to anymore.

The one that was my fault was the night before a trip - taking the advice
of some friends I put an old spark plug in the hole and it worked
perfectly. I later bought an oversized one with a piggy back and it worked
fine as well.

The other has not been fixed yet - it is sitting in my garage. I need to
fix it before selling it. Anyone need a godd 2.1 engine ??
Thanks,

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