i have a ford focus 1.4 2002 model.When it is sitting idle.The rev,s won,t drop below 4000 rev,s.I,have had the air intake valve changed and the idle control valve changed and it is still doing the same thing.Could it be the ecu unit that is faulty or could it be something else.

KEVIN AGNEW, April 2013

i think it may have to go onto a relevant code reader to look at live data and to check what various sensors are doing/operating in a correct manner

cdc, April 2013