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1971 911T Zenith carburetors

Fuel System

Vehicle Information: Model: 1971 911t; Year: 1971; Body Type: Targa; Engine (type, size, modifications): 2.2; Total Mileage: 95,000;

I followed all the instructions on the posted questions pertaining to carburetor adjustment, timing, spark plugs ect. with no luck. My Zeniths just won't idle. When I first start the motor it will idle fine for about 10 to 15 seconds then it slowly starts to starve for fuel. I'm a hands on person and I know there's a passage somewhere that needs drilled out. I've been told to get rid of the Zeniths, but I'd like to keep it stock. Whats your best bet on where to start drilling? Is there a published fuel flow schematic I can follow?

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