ב״ה
Happy Update : Thanks God , found
the problem !
I bought my KZJ95 3 years ago , it was very slugish, barely moving and then i made a huge mistake to add (too much) diesel to the oil to flush it ... self inflicting a spun balancer bearing

so i had to take it all apart and delete them...
Checked compression and it was like new so just replaced all the bearings on the way.
Turbo housing was cracked

so i got a Mamba housing and a decent enough cartrige
Opened the IP and found a broken plunger spring

, cleand, replaced and reassembled
Got new Denso injector nozzles, put everything back and no start (for about 8 months) checked everything possible, thinking it was me again messed up somewhere on the way ...
After giving up and strugling for too long the take the IP out with radiator and condensor in, sent it along with the injectors to a rebuild shop... the guy asked me : "What the heck Issuzu injectors are doing in your car , of course it does not start cause you put Toyota nozzles in Issuzu holders..."

i was amazed again but little i knew back then that somewhen, a way to creative shop also drilled the return valve fuel orifice from about 0.3mm to around 2.5mm ....

probably to relief the higher pressure to match the alltered injectors (just a guess)
So this last fact is what i found out today 26/7/5785 (29/10/24) after almost two years of agony and endless sessions of trial and error, testing and watching all the Pakistan, Hindu and Russian videos with autotranslation

.
Comparing the return valve with a spare revealed the difference right away, swapped it and pure happiness happened, revving it up suddenly sounded very different and it was fast and joyful as never before.
Driving it was amazing for the first time and the term Mighty 90 finally makes sence... had no idea