The regulator. Might have somthing there. I don,t think anybody at these auto repair shops have thought of that. Just disconnect and plug up the vacum. Might do just that. Also, If I happen to be out and the car acts up again. What might be some quick fix things I can try just to get the car home. Or at lease out of the road. Thanks John. Also, I.m still perflex about the issue of a sensor working sometimes and not working sometimes. Also does anyone have a time machine so I can go back to 1970? LOL. Thanks, John.