Sounds like you might have an air leak, do you have an AFR gauge? If the map sensor line has a small leak it will be rich on idle.

Have you spoken to your mapper Rikki as really this should be your first port of call rather than a forum.

There are a lot of issues which can cause this. For example, the closed loop idle strategy looks to see if the throttle is closed before entering idle mode. If your TPS is faulty your ecu will not enter idle mode.

- Map line air leak as said,
- Faulty idle valve
- TPS etc.

And don't rule out mechanical issues such as a head gasket etc.

And to answer Jano's question, no it is totally as per the original ford EEC-IV so is not sequential. Sequential injection doesn't magically = good idle.

Rob,