There are a few possible reasons why exhaust gas might be coming out of your carburetor:
* A blown head gasket. This is the most likely cause of exhaust gas in the carburetor. A blown head gasket allows exhaust gases to leak into the engine's coolant system, which can then be forced out of the carburetor.
* A cracked cylinder head. A cracked cylinder head can also allow exhaust gases to leak into the engine's coolant system.
* A damaged exhaust manifold. A damaged exhaust manifold can allow exhaust gases to leak out of the engine and into the carburetor.
In any case, exhaust gas in the carburetor is a serious problem that should not be ignored. If you notice this problem, stop driving immediately and have your car towed to a qualified mechanic.
