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check air flow duct where the throttle valve is . check the pvc valve . make sure it isnt stuck open. check the egr valve . it will stick open stall out motor .use a scanner it will tell you if you got egr valve problems. check fuel pressure. it could be stop up fuel filter bad fuel pump fuel pump relay.your car problem sound like a major vacuum leak . change spark plug and wires if they have not been change in a while. it could idle air control. hook a scanner .it could give you a code.
Your choises are...bad fuel pump, restricted fuel filter (new?) bad fuel pressure regulator...out of gas....can you pinch off the return fuel line to the tank? some are rubber and some are hard plastic...dont pinch the plastic. This will give you the unregulated pump pressure. If it doesn't go up you have a bad pump or it's drawing air from the tank (pick up restricted/fell off or no fuel) if pressure goes way up and runs good your regulator is bad