What will cause an engine to stall at idle and lower speeds?

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We have changed MAF, spark plugs and wires, O2 sensors, fuel filter and tried fuel injector cleaner. When you start it you have to hit the gas constantly or it will stall, you can't stop at res lights or stop signs without holding the brake and keeps the gas on also or it will stall. It starts right back up after it stalls. It runs fine once you get moving, it has some loss of power. What seems to make the problem better or worse? Stopping or driving at low speeds How long have you had this problem? A few weeks