Hi this car has come in from a car sales with engine management light on complaining of holding back and smoking at times,we scanned system and only 1 code stored 008213 intake manifold flap position sensor ( bank 1 ) implausible signal intermittent.have done usual output tests and all seems ok, checked wiring and hoses etc.Have removed plastic part of intake manifold so we could see flaps all seem ok a bit carbooned up?not sure what next step should be any help would be good.Thanks Paul