Starts, but loss of power

Engine stalls or RPM fluctuates at idle up and down or dies near idle.

This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve but always run a OBD2 fault code as well as the cleaning procedure. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control

Sounds like dirt made it's way to the fuel pick up from sitting on an angle. You can try removing the sender through the rear seat to detect a clog and or the fuel filter underneath. Honestly..... have it towed to reputable repair shop or dealer for evaluation.

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Sounds like you have a serious vacuum leak. Don't bother checking the fuel pump in tank, it's working, otherwise it wouldn't start and idle. Vacuum loss will cause it to die because when you open the throttle even a little, it gets too much air and not enough fuel at the same time. Check that all vacuum lines are connected and not off or badly cracked.

allow it 10-15 minutes before you start driving to warm up while it's idling.

Replace the fuel pump in gas tank and install a new gas filter

It sounds like you might have a clogged catalatic converter on the exhaust system.

change the egr valve

If you felt a loss of power, you had to press on the gas harder before it died, you may want to check on the fuel filter.  Otherwise you may want to check on the fast idle valve or pcv if it needs cleaning, or vacuum hoses if they have leaks which may be the cause of the rough idle if its an EFI engine. 

check for vacuum leaks at throttle body gasket. pvc valve stuck open.if all is good .change fuel filter .if still stall out check fuel pump pressure.if all is good .replace plugs and wires if they have not been changed.

you need to replace your idle air control valve