Found the coolant leak, its the thermostat housing so that easy to sort out.
Still not sorted out the rough running, not really been too bothered since getting the Fiesta ST but now the weather is nice i fancy taking corrado out.
Not sure where to begin though. Starts fine and idles ok, but as soon as you try to accelerate it goes really lumpy and misfires with pops and bangs etc
Think i need to start from the beginning and just go through everything, nothing shows up on vagcom. Can a cat falling apart inside cause this, might take it off and have a look as its the original one still.