Reverse the fuel hoses going to the fuel tank, only to test, run for thirty minutes, if it cleans up the issue is a plugged tank strainer.

Remove the injectors and check spray pattern + pop test.

Carefully inspect the prechambers while the injectors are out, damage or fouling could do this.

Have a great day.

__________________
ASE Master Mechanic
https://whunter.carrd.co/

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Vehicle build.
Fleet Durability
Technical Quality Auditor.
Automotive Technical Writer

1985 300SD
1983 300D
2003 Volvo V70

https://www.boldegoist.com/