Map sensor? Edit - I see you've put flow sensor, which I'll assume you meant MAP as there isn't a MAF on 1.4s. 
Did it suddenly go like this? I had a similar issue on a 1.4 a while back where the coil pack failed, but it spiked the ECU, and even after the ECU being 'fixed' it still was never right and I ended up selling it on.
You could also check the earth points incase they're dirty/broken, gearbox earth and ECU earth at least.

Did it suddenly go like this? I had a similar issue on a 1.4 a while back where the coil pack failed, but it spiked the ECU, and even after the ECU being 'fixed' it still was never right and I ended up selling it on.
You could also check the earth points incase they're dirty/broken, gearbox earth and ECU earth at least.