[MetroMPG]

I wired a momentary interrupt switch in line between the distributor and the pickup coil. Not sure if that applies to your car or not - it's new enough it may have individual coils per spark plug.

Don't use an on/off switch for engine kill. You will occasionally forget to turn it back "on". (Ask me how I know this.)

I suspect if you're having trouble doing a smooth bump start, that you might not be doing it the best way. I really should start a new thread on this, because it comes up regularly.