the injection malfunction light comes on at high revs and the car seems to reve by itself when i have the clutch in and foot of the accelerator(between 1500 and 2500)i have been told that this has something to do with a timing valve is that likely ?
Could be a faulty idle control valve (disconnect it and if the problem of the revs hunting is still there then you can rule it out), lambda sensor or air leak on the inlet (can't imagine that there is s a sensor for this unless the inlet manifold pressure shows a problem) . The best bet in my opinion is to take it to Fiat garage and get them to read the fault code from the ECU - might cost £40 but it will save an awful lot of time and money if you start replacing the wrong parts.
Andy
Its definitely the idling actuator (aka idle control valve). Mine did exactly same thing last month!! Cost around £149 plus VAT but you can easily fit it yourself in 10 mins.
MotorsForum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.