Try this thread for help for a similar type problem
http://www.nissanpatrol.com.au/forums/showthread.php?13027-Severe-loss-of-power-in-ZD30-Patrol
Try this thread for help for a similar type problem
http://www.nissanpatrol.com.au/forums/showthread.php?13027-Severe-loss-of-power-in-ZD30-Patrol
Have you changed the fuel filter? If the issue still remains, by pass the fuel filter total and try again. A member here has some issue like this a while ago, I gave him a spare filter head I had and...
It all sounds like A MAF issue but can't explain why there is no error codes , have you tried a known good MAF out of another Patrol ?
Hopefully someone who knows more will be along to help .
Each to their own, but I can tell you from my own experience and that of another Dtronic Safari chip user that stock ECU mapping with Dtronic is no match/no contest for Harvey's ECU re-map. And...
I will keep my eye out for you. I am based in Halls Head. :)