My mechanic set it to 0.9rpm and when I turn on the A/C, it lowered down to 0.8 then started shaking. I think it's too low, i have to step slightly on the accelerator for it to calm down. My friend who also has a vanette told me na naka 0.5 daw yung sa kanya. Shucks! that's even lower! what could be the correct adjustment for this?