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bad seal in between your intke manifold and carburetor
Check for FP leaks at the FP regulator and gasket (at TB unit) and possibly leaky pump.
oil leaks
vacuum hose leaks off the carburetor.
Hard to answer this question without more info, but check to be sure all cylinders are firing and there are no vacuum leaks. Verify the flywheel or ring gear is properly attached, and the harmonic balancer is ok.
Sounds like it's running out of fuel. Check fuel filter, vacuum leaks, fuel pump, etc.
float valve or float are bad
check for vacuum leaks
Does this vehicle have a carburetor or is it fuel injected? In any case start with looking for vacuum leaks.
Replace the freeze plugs.... All of them. Chances are if one has rotted through, the others aren't far behind.
check your coolent fill cap
The float in the carburetor is stuck open. It is letting fuel flow through the carburetor into the intake and into the cylinder, filling up the cylinders with fuel. once full it leaks into the crankcase past the cylinders and past the valves into the head under the valve covers which , in turn drains into the crankcase.