I seem to be having a few problems with the motor.

1. Car stalls when taking a U-turn or some corners.
i'd get a 200B repair manual for ebay or a secong hand bookshop but it seems you are running out of fuel

2. The flap on the carby doesn't close all the way. It's a few millimeters out from closing fully.it has to be open a little bit for idle.

3. I took the standard air filter off a while ago and want to fit the standard air filter back on. I forgot how to connect the hoses back to the air filter. I have the thick engine air inlet all sorted, but i forgot where the vacuum hose connects to. (on the air filter it has 3 inlets, one for motor, one for vacuum, and another that has a point looking inlet)
**sorry i know what im talking about but its hard to explain when i don't know the right terminology**again get the manual pictures speak a thousand words

4. I am tearing through fuel. I only get around 300ks per a full tank (if that). driving normally! I use unleaded 98 from BP and add the Valve Saver Fluid
Don't use valve saver you don't need to! the car has an alloy head and hardened valve seats....

5. Also the car used to keep running when i turned the car off, but i had my timing, points, leads and plugs all serviced like a month ago. I was told by a mechanical engineer to pour 1 Litre of Metho in the tank with a quarter of petrol to remove all the carbon build up around the valves (i only did this once). Not sure if this could be a problem with the car stalling

6. Is it normal for the car to stall when i turn it on and not rev it (the car is automatic)Are you using the choke?

Sorry for so many questions and i hope you understand, sorry I'm not that intelligent when it comes to cars, but I'm learning