Q: Starts runs for 30 sec. Shuts down.

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Car starts runs for 15-30sec shuts down.

My car has 100000 miles.
My car has an automatic transmission.

Hello. This behavior suggests that the carburetor needle & seat are sticking, and the carb requires some adjustment and/or a rebuild. These fuel valve components allow fuel pressurized by the fuel pump into the carburetor float bowl (and from there into the engine). If the needle and seat stick, the process of re-filling the float bowl of the carb interrupts the running engine. Starting the engine probably jars the needle valve enough to let some fuel in, then is closes the valve - a repeating cycle. I would say that you should rebuild the carb. If you would like to have this checked by a professional, a certified technician from YourMechanic can come to your location to inspect the stalling problem and proceed with repairs.

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