Re: Ah, Tony D, but...
Yes, restricting the airflow would cause it to be rich. Indeed you are correct. So rich, as to say the fuel may pool, and run down the intake as a solid mass of liquid. This would cause hydrolocking, and resultant head-gasket (if not head completely bloweth off!) blowage! Never mess with the master...
I saw a Ford truck hydrolock at about 4500 when he went under water. It was really funny to watch his face as a BIG dent popped into the left side of the hood almost instantaneously with the BOOM of the motor going away. The dent was caused when the head bolts broke, and the head blew off, hitting the hood! 1978 Ford F250 4X4. After that he didn't seem so keen at taking "cross the river here" challenges without putting a stick in to check for deep holes...
We all thought it was hilarious..