How does it drive ? Able to get full throttle/decent acceleration or does it struggle?

Or is the running fault purely the idle concern?

With that P1131 it may be because of low fuel pressure (fuel pump/blocked filter etc) usually air leaks though.

If it will rev out cleanly though, I doubt it will be a fuel pressure problem, worth checking though.

I would ignore all those dash codes and get the car diagnosed properly on Ford IDS (As oldford said in the other thread)

On the modern cars all the systems are inter-linked so an engine sensor problem can bring on other warning lights.