[Superman]

Yes, the '76 CIS system is pure mechanical. No, it is not MFI, but it is purely mechanical in that there are no electronics. No computer. The position of the sensor plate pushes the plunger up into the fuel distributor and you get gas. Yes, if the air flow sensor plate is sufficiently misadjusted, then there could be fuel getting sent to the engine when the sensor plate is at rest. But the other thing you'd need is fuel pressure. With just the key on, I believe the fuel pump should not be running. And so, the amount of fuel in question would be quite low. System pressure would bleed quickly. And also there is the cold start system. It is a seventh injector located probably in the back of the air box. It is an injector with a square electrical plug attached to it. It sprays temporarily while you're starting the car. It requires less fuel pressure than the six CIS injectors.

Set the air flow sensor plate rest position according to the specs in the book, or at least verify that it is set correctly. If it is not centered, a slip of paper around the plate while the bolt is loose will sensor it. Also make sure your fuel pump does not just run because the key is on. That's a safety problem.