[brillo]

I've tried shutting off the A/C and I occasionally still get the surge. I totally get that the A/C compressor and general idle characteristics mean idle is going to flux 100 rpm or so. Those kinda rpm fluctuations don't even register on the car's tach, but I can see them on my scan gauge.

Jumping up 150 rpm or so seems a little more unusual, which is why I was wondering if maybe I'm seeing something related to the injectors needing to push more fuel at idle on e85 than normal and that is resulting in the surge (could the port injectors be kicking in?).

Its not something I feel as the rpms never fall as part of the process to a level where the idle gets rough.