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[Enceladus]

And I have no idea what did I fix exactly 
Well, after cleaning,  the ,, bad rpm sensor,, no longer shows on diagnostic so I suspect that cleaning the connector helped. Also the small vacuum that is behind the top of the engine and is connected with a small U shaped rubber hose., I cleaned that and fixed it to be in place, it was out of his place.Only thing that I don't know is where that vacuum plastic pipe that goes from it to the front of the engine where should be connected.

As I recall the vacuum hose with the U rubber connects to the changeover valve at the top back left of the plenum chamber on the top of the engine. The U is inverted when connected.

Doesn't the other end connect to the vacuum reservoir or the multi-ram valve situated in the intake air pipes at the front of the engine? Or somewhere in that vicinity.

[Doctor Gollum]

It connects to the throttle body, underneath

Multi ram reservoir vacuum lines run over the 246 cam cover. There is a guide/faq on their routing 

On the 2.6/3.2 there's a vacuum line from the throttle body to the fuel pressure regulator and is only just long enough to connect the two, and is therefore almost always overlooked. Not sure if this exists on the 2.5/3.0, so responses may be at crossed purposes 

[zirk]

Zirk's EU magic number is 282

So for reference 18 to 21 L per 100km is
282 / 18 = 15.6
282 / 21 = 13.4
Therefore 13.4 to 15.6 mpg

Like wise 13 to 16 L per 100km is
17.6 to 21.6 mpg

282 also works the other way ie
25 mpg is 282 / 25 = 11.2 L per 100km

[Gintonic]

Update, heavy rain for 3 days, driving in heavy rain, the rough running of the engine came back. So it's definitely some electrical connection going bad on rainy weather. I have no plastic protection cover beneith the engine, I m getting one ASAP, but I don't think that would make some difference

[johnnydog]

Any mention of heavy rain, and on a 3.0, would make me look at the ignition coil down the back of the engine by the bulkhead. Maybe your liberal spaying of the 'connectors' was just good fortune and a coincidence that it began to run smoothly, and the recent heavy rain has run off the scuttle and onto the coil / leads causing the actual problem to reoccur.