Renault Traffic 1.9tdi, no gas

Hello everyone.

Vehicle: Renault Trafic II 1.9
Year: 2006
Mileage: 190,000 km

The following problem:

After a short drive (e.g., to go shopping), the engine is warmed up, and I turn off the engine. (Up to this point, there are no problems.)
After 10 minutes, I went back to the car, started it, but now it's not responding to the accelerator. The engine speed is only about 500 RPM. I think the normal speed is around 900 revolutions per minute.
Also, it's running quite erratically. It's gotten to the point where I've been stuck on some parking lot for an hour and couldn't go any further. It's been going on for a few months now, and slowly, neither I nor the various [people/departments/etc.] know what's going on.
Workshops continue.

The following items have already been exchanged:
- Air mass sensor
- EGR valve
- Fuel filter

Here are a few other things I've noticed:
- Higher fuel consumption.
(Normal = Full tank = 1000 km)
(Currently=Full tank=800km)
- It frequently occurs when the outside temperature is warm.
"However, I've experienced it even at -10°C, but it's quite rare."
- The engine usually doesn't respond to acceleration until the...
Engine temperature has decreased. (Temperature and fuel level are being monitored.)
(Displayed as a digital bar) meaning if they are reduced by half.
certainly.
- idles roughly.
- seemingly reduced performance (but it's not a limp mode, you can still...)
despite everything, driving at 150 km/h )

I hope you can help me.