Well, you've basicly described my problem, but it happens to me when its running period, driving or not. My motor is carburated though, but it could still be the same thing. I thought it could be a vacuum leek or a leek in the break lines resulting in a leek in the vaccum system. Also, I know nothing about electronics or automatic sensors. The only thing automatic I get out of it is a headache and fried fingertips...