has your car had any kind of superchip fitted???

I had the same kind of problem with my si.

The car had been fitted with a powerchip!
The car showed the same kind of problems you are talking about.

I took the car to ford and they could not find any fault!

It wasn't until i took my car to a Local Autoelectician that the found the fault.

They removed the chip from the ECU and replaced it with the standard factory one.

All the problems that i were having cleared instantly!!!!

Hope this is of some help to you.

cherb