Q: Suddenly a whole lots of problems have occurred!!! Help!

asked by on September 05, 2016

HELP: Can anybody help me diagnose this problem I have a 400 in my 1976 cougar with a new carburetor new distributor cap wire plugs rotor coil starter selenoid brake master cylinder. As of two nights ago I parked it running fine and went to drive it The next morning and it had these issues.. It was only idling at 2-300rpm, it stalled on me so I turned the idle screw all the way in and it's still only running at 500rpm's?it's very rough and has quite a bit of backfire, it's overheating, hesitates a little on the gas, and for some reason the brakes become very stiff and weak when I'm moving slow like trying to park or something? I don't know or understand how all these issues can come up at once please if anybody knows what is causing this let me know!

My car has 9000 miles.
My car has an automatic transmission.

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