clear flood mode = WOT/foot to the floor. simply cracking the throttle won’t put it there.
To me it sounds like your IAC is questionable. Not starting unless the pedal is depressed = no air getting past the throttle plate, and not staying running unless you keep your foot there makes me think the ECU can’t control the pintle movements in your idle air valve.
To clean your MAF you don’t *need* MAF sensor cleaner. Any non residue electronics cleaner will work. I’ve used rubbing alcohol and I’ve used carb cleaner…many things.
If you can, I would pressure test the cooling system and check for any signs at all of intake gasket leaks. The dirtyonehundred V6 is notorious for OEM gaskets going south.
Does your check engine light illuminate when you first turn the key forward (but don’t start the car)? All cars do a bulb test with the key on engine off. You’ll know if it’s functioning or not.