Erratic idle, problem solved!!

[sfcl]

Just spent 2 hours removing everything around the intake to solve the rough idle problem. Throttle body, ICV, air adjusting unit and others have not been so clean in all their life! Finally discovered that one of the vaccum hose of the LPG system was cracked! Unfortunately this hose was almost impossible to reach under all the other components so it took some time... Ironically, this LPG system didn't work since a long time as there is simply no LPG on the island, I'm using common fuel!!
I'd like to thank all those who helped me by trying to locate the problem.

On the other hand, difficult to see, but I have noticed an oil leak on the LHS (driver) side of the engine, just below the inlet manifold (maybe 5 or 6 centimeters below the front side of the manifold). This is not the cam cover gasket (I checked). What could it be?

Thanks once again.