i'm using a 8v'er
and sparks are dry. i believe it might be fuel starvation, but nevertheless, as i was using my constructed 'switch', it started up nicely without any coughs or misfires, the only thing is that before it warms up to normal temperature, without acceleration it tends to stall. i needed to push accelerator pedal to keep up revs.
whenever heated up to normal working temperature, it's fine, revs keep jumping a little by +-50 rpms