Peugeot 206 stop problem

After the friend changed to the diesel filter of my 206 diesel car, the starter started running late and started to stop while idling.
I wonder if anyone can help, it's very annoying

Are the hoses of the filter fully installed? Has the air been thoroughly taken? In addition, it is necessary to have 2 sensors, have they been replaced and connected sockets?

All of what they said was done, but I think there might be a leak or a mess with a hose.

The problem persists. Does anyone have an estimate of what we can connect to the computer over the weekend and see

Hello, the diesel filter you have changed may have been problematic, and when I was working in my car and stopping at idle a little bit, it was not receiving a starter, but if I pumped it with a hand pump, I experienced this problem for a year.

Low probability

I have 206+ diesel vehicles. It happened to me too, the car was stopping where we stopped. I took it to my mechanic friend, when I connected it to the computer, it gave the diesel filter error. Afterwards, in the control we made, there was a feather under the air filter, the engine oil had become bitumen. There is no need to mention the diesel filter. The friend who sold it said we just did the maintenance, we changed the filters (I respect my mother here), I immediately replaced all the filters in the oil store. The sound of the car and its course have also changed. It did not stop.