Need help: engine turns off on it's own

I got a 67' Valiant with the /6 (170) super6 intake. My car won't start unless I spray fluid starter, once the starter fluid burns out, it shuts off. I adjusted the the screws on the carb, making it idle higher. It idles high. If I hit the gas while the car is not in gear, it shuts off. Once the car is running, it runs good, just sounds louder, but once I have to slow down to 15mph or less/ or even stop, it shuts off. I have to hold the gas padel and brake at the same time so it wont shut off. When the car shuts off, the oil light truns on. The oil level is where it needs to be at. I was told be "mechanics" my timming is off, my fuel pump is bad, and possbile the carb is gunk'd up. My car was running fine before I took it to the shop to have the brakes done, but once I picked it up, she was kinda "struggling" once I hit the gas. I had the spark plugs changed, the wiring, and rotary cap. I changed one wire at a time, so I know my plugs are in order, plus I also checked the firing order and the placement of the first spark plug. I really don't want to go and buy new everything, when I could be simple thing.