Originally Posted by
H3lsing
The 1.4 doesn't have a MAF sensor. So I don't know what you unplugged initally in your OP. That PCV hose is usually the culprit and in this case. Glad you sorted it. Happy Christmas

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Oh ok! I did wonder why it made no difference to the car when I unplugged it. I wasn't 100% it was the MAF, but after googling I got the impression they did have one. It must have been a MAP sensor I unplugged - the one at the engine end of the inlet hose.
Either way, I found the fault. Just as well I didn't try and order a new MAF!!!