There seem to be several different faults with this engine the first issue is idling performance. To tackle this you need to have a fairly methodical approach. Check that you do not have any air leaks on the manifold take off pipes, etc. also, check that you have the correct voltage on the throttle potentiometer and that your emissions are no higher than 2.5 per cent CO with the HC also less than this it may be worth looking at the air flow meter and trying another one of possible.
The final check is fuel pressure in the fuel rail. This needs to be checked to determine that your pump and regulator are working correctly. If all of these items check out okay I would be tempted to change the idle air control valve. However, as the exhaust is covered in black soot, then this suggest that your engine is running far too rich.
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