Hello and welcome to JustAnswer.com!
Based on the symptoms it sounds as if you may have a plugged exhaust. Sometimes the catalytic converter can get plugged up and cause exactly what you describe.
Try removing the oxygen sensor (between the engine and the converter) and if it seems to run normally with this remove due to a large hole being open in the exhaust then it is plugged up.
I tried removing the O2Sensor and it still does what it was doing, and I can feather the throttle and it will rev fine its when I quickly mash it to the floor is when it does it, its like you shut the key off
yeah you have something going on there. Your situation due to the fact so much has been done already would be better suited to a live hands-on technician. You will need to find one with talent and not just a parts changer, which many are.
Good luck and any advice or help i can provide, let me know.
I was wondering if the knock sensor would cause the vehicle to act like it has a misfire? and would it cause stalling? and also would the mass air flow cause the same problems?
lol, your good. good luck with the car :)