Rite I've got a problem with a sierra 2.8 injection I bought it as a project as non running the guy said the petrol was off which checking it was as it was yellow and stunk of a duckoil smell on starting it it struggles but eventually starts but runs like a bag of shit but will not rev at all if I work the fuel/air flap by hand and operate the throttle it revs rite through. I've changed the fuel and filter obviously and now the metering head and it's no different. Don't know where to turn now any help appreciated