How Quickly Should Engine Shut Off?

How long should it take between time the key is turned off and time engine stops? Immediate? In my car, there is a lag of about 1 sec. May be my imagination but it seems longer since I had valves adjusted and "hollow" bolt cleaned last week. I've looked for loose fittings and don't see any.

My center dash vents are acting up a bit too...don't always blow air when they should. Could that be related? Other vacuum components (locks, trans shift) appear to be working fine.

Thanks,

Nic
'85 300CD

Thanks for info Donkey, it sounds right.

Those lines disappear into the firewall. Can I see them if I remove the plastic cover under the dash on inside of car?
I assume there is a junction up there somewhere.

Nic

ok Donkey, I'm convinced about the tester. Have read about it many times. I am pretty good with tools but lack experience....will let OJT overcome that. I do have a Haynes manual.

I'll look carefully at all connections and, while there, identify any that appear cracked or worn so that I can replace them.

I'm also going to replace the vacuum pump itself within the next six months.

Thanks for pointers.

Nic