Focus C-Max 1.6 TDCi Shaking Post-Drive: Diagnosing Causes (Engine Mounts, Injectors, Alternator)

Hello everyone ? I have such a question - in my C-Max it happens that when the car is cold it starts and works great, but after a long drive when it stops for an hour, it shakes the body terribly after restarting - the revs are equal but a bit lower. .. because I overeat a bit, everything is back to normal. The injectors have been checked - overflow tests, dual mass, engine mounts, alternator and everything is ok. Does anyone know what can cause such a swing?
Thank you for all your help

Hello, in the 1.6 engine there is a rectangular hose-pipe, check if it is tight, I had a similar problem in Focus 3 and that was the reason, the pipe was getting softer under the influence of the engine temperature and as a result, the leakage became bigger and it caught the left air

Thank you, buddy ? Today, after work, I will check - it is on the left, standing in front of the engine, no? I will say that on Saturday I cleaned the EGR valve and the flow meter - it helped to such an extent that the car seemed to accelerate better, but unfortunately it is still as cold as it is ok, if it is warm it is ok, and if you drive it for a long time, it will turn off and it will fire again after 30 - 40 minutes, it has low but even speed and it buys the whole body until it catches more temperature or sometimes you need to gas it ? Today I will check this hose and let you know what and how ?

Hello, I checked this hose and it is tight, but I noticed that after turning on the electric receivers, the car starts swinging the shed and the charging drops to 12 V, and when I turn it off, it returns to 13.7 V and the engine runs normally. Is the battery running out or the alternator is already raining ... Today I will check if there are any voltage drops, although on one forum I read that in these models some heater is finishing the batteries ...

Added after 42 [minutes]:

So yes - I checked the charging with a meter and the same charging is on the alternator as on the battery 13.7 - 13.9 V. But when I turn on the receivers in the car, i.e. lights, heating the front and rear windows, air conditioning, the charging jumps once it's 12, 5V and after a while 13.9V and as for a change, and when I turn off the receivers, the charging returns to 13.7 - 13.9 V ... Has anyone already processed something like this? I would like to add that the charging indicator is not lit and there is no error in the computer regarding damage to the intelligent charging system. To be sure, I will connect the battery to the rectifier overnight and see how it will behave after recharging.

Hello everyone I managed to solve the problem ? Thanks to the information obtained on another forum (the reason for such rocking may be carbon deposits on the injectors) I decided to use Liqui Molly diesel Spulung injector cleaner (or something like that) ? When replacing the fuel filter - I poured the new filter with the aforementioned agent and mounted it to the car - after firing it, the car worked for 20-30 minutes at idle speed, then I filled up with a full fuel tank (regular ON) and added 150ml of 2t oil to the full tank. The effect is that the rocking of the engine has completely stopped, no matter if the engine is cold or warm - after firing it goes smoothly at equal speed ?
I hope this post will be useful to someone ?
Yours sincerely ?