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It can be any of a number of problems. Possiblities are: Oxygen sensor, air filter, fuel filter, plugs, wires, rotor, distributor cap, throttle position sensor, MAP sensor, carburater, compression... and who knows what else without knowing more of the symptoms. If the vehicle is injected, it probably has a computer diagnostic port. If that's the case, borrow, rent or buy a code scanner and use it to find out exactly what the computer has detected. egr valve i just went through the same issue

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2008-01-12 02:27:55
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Q: Your 305 engine starts but wont idle and you must keep pushing the gas to keep it the engine running as soon as you let off it dies what is the problem?
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