First it could be the mass air flow senor but before you go spending a ton of money for it .Is your check eng light on if it is not then probally not the mass air flow.if it is first try cleaning it to make sure the door is free to move also make sure the connection is good and clean.tapping on the top of the senor some times makes the check eng light go out if this is the case then yes the senor is probally bad.
but what your explaining (if i read it right) sounds to me like a TPS switch is bad the TPS switch tells the car how much gas to give at certain times.if it is bad then the car does not know when to give it gas witch is why you have to manually give it gas to keep it going.
Hope that helps.
i am a collector of probes and a certified mechanic
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