My mr2 is barely idling. Where can i start a process of elimination?

What is your question?

I have to use both feet on the peddles to start it. It idles so slow that it dies. I had fault codes p1646 p1647. I removed the fuse for a time and i unhooked the negative cable from my battery to fix the faults once i tried to start it the car sounded like it was out of gas or flooded but i pushed on the gas and brake/clutch and it started but wouldnt idle.