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Either you have a plugged fuel filter or your catalytic convertor is plugging up.Fuel filters are cheap so try that first then if that doesn't work then you will need to look into a convertor
Is the check engine light on while the engine is running ? If it is I would start there for clues. If not, the list of possibilities is long. You should check the fuel pressure and probably the throttle position sensor resistance. It could have a vac leak too.
There's an air return pipe that's supposed to prevent this. Look on the filler neck for a finger sized secondary pipe or hose. Make sure this is not damaged or otherwise blocked.
Spit back can also occur when the tank is nearly empty on hot days. The tank is full of gas vapour and this pressure has to go somewhere. Try adding gas slowly for a couple of seconds, then stopping. The added gas is colder and will cause the vapour to condense, after which you can usually add gas at normal speed.
I would give it a basic tune up, spark plugs and wires. If the problem persists try the mass air flow sensor, otherwise have a mechanic set the idle speed.
i have a 1976 911 that also spits back i think its just a design fault try putting the bowser nozzel in completely upside down i find this helps with mine
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