Sorry for delay. You see, I do some background checks on cars sold outside USA. (I live in US and all my books, data and computer data is more geared to US vehicles we sell or import here) You'd be surprised at the equipment and emissions differences from Country to Country!
At any rate, there's no system or equipment I came across that concerns me. I have some ideas that will help you quite a bit.
First off, your engine shows poor performance. That in itself gives me some immediate direction because of the other symptom. You have a hanging idle as it's called, for one. And - you have what appears to be a misfire as well.
Let's do some quick checks >>
Obvious things that can cause elevated idle and poor performance:
1) A vacuum leak at air intake. This can be anything from an intake manifold gasket cracked at an intake runner, to a vacuum line going to intake, or a leaky power brake booster. Does this problem ONLY happen when your foot is on BRAKE pedal? Try it out. When it acts up release brake. Any change? Try this too: Apply brake in neutral, wait 5 seconds or so and release.. Any change at all?
2) As stated above, a vacuum leak, AKA "unmetered air" can cause high idle, stalling and/or poor performance and misfires. Can cause one, some or all of these symptoms. Can cause other symptoms (not listed here) as well.
3) Similar to above scenario, when the large, rubber/plastic air intake TUBE mounted to the Throttle body - and then connected to MAF (mass air flow) sensor has a CRACK in it - you have vacuum leak type symptoms most often. This is unmetered air. Check this tube and clamps for it as well, at the MAF.
Who tested your fuel pressure as stated in your initial Question? Did they test fuel volume as well? Have you access to a scanner? You may Accept this Answer if you choose. If you do so now, I am definitely here to see this thru. So feel free to post back as needed.