Reminds me of the bottled miracle that a guy that worked for me was pitching 25 years ago. Clear stuff, light liquid in a clear bottle. "Z" somthing or other.
The pitch was, that when you put it in your gas engine, the idle would increase by a couple hundred RPM. Took a hundred miles or so for the idle to settle back to what it was before.
Gee, do you think maybe it is flaring off, and finding its way into the intake, through the PCV?