Bronze Bird, are you noticing any increase in engine temp? Took her for a drive today with the En-valve today, and it came up to temp quicker and idled around 190 vice 180 degrees. Didn't get above 195, and it was a warm day today so I'll have to see on my next couple of drives. It would make sense that the temp would increase since I'm injecting fumes back into the intake. My idle seems to have increased about 100rpms like yours. I'm thinking of adjusting the mixture to richen it up a bit. I think the fumes are leaning out the mixture....thoughts?