With out knowing what machine you have, may be a little difficult to diagnose.
Bad fuel filter
Leak in fuel lines, pulling air
Plugged fuel tank vent, vapor lock
Plugged fuel line, pinched or collapsed.
Bad or improperly adj. float.
Dirty air filter, air induction blocked(rats nest).
Bad spark plugs, plug wires, coil pack.
Bad Fuel pump.
Bad intake or head gasket.
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