Lancer 2010 intermittent stalling and rev drop
 

Hello everyone, I have a 2010 1.5 petrol 4A91 Mitsubishi Lancer. When I press the clutch the engine rpm drops below 500 and in cold weather the engine dies. Sometimes everything is allright. Please see the attached video.

We have changed all sensors, the throttle body and injector rail from a same type of Lancer without any luck. The other car works perfectly. The car got new spark plugs and engine flush and fuel system cleaner. 4 garages were checking the car without fixing it.
The compression is 155psi in cylinder 1,2 and 4, but 115 in cylinder 3. I think if the compression would be the problem then the fault should happen all the time but it is an intermittent thing.

Any idea would be greatly appreciated.