polo 1.4 16v AFH engine running rich

[patorce]

Hi

i have some fuel ratio problem which i cant detect where and what causing it. Spark plugs turn dry black and there is smell of gasoline from the tail pipe. Also engine works like on 3 cylinders. I did compression test on cold engine and the results were 11 bars on all 4 cylinders and second test on hot engine were the results were 12 bar on 3 cyl and 9 bar on 1 cyl. Other thing i noticed when i disconnect the vacuum hose from the map sensor to the fuel pressure regulator engine revs stabilize there are no jumping between 900 and 1100 rpm and engine doesn't shaking that much. Is there anyway i got vacuum leak in the intake manifold and how can i check that. Also i clean the injectors which looks like give good spray pattern.

bd - YouTube

spark plugs - Image on Pasteboard

Any advice idea fix are appreciated