Hi, welcome to this great forum I joined here nearly a month ago and found some very helpful advice on repairing and maintaining my 1999 GU RD28Ti.
As PeeBee stated you need to be more specific, provide more specs about your vehicle etc ...
When I joined mudnut pointed me to an excellent guide for the 2.8 litre Patrol here:
http://www.nissanpatrol.com.au/forum...hings-to-check
Here's some other threads that may help you:
http://www.nissanpatrol.com.au/forum...er-when-towing
http://www.nissanpatrol.com.au/forums/showthread.php?597-Checking-and-cleaning-MAF-sensors
This is what I would check if I was having power problems:
Check / test all Vacuum lines especially the one to the turbo Waste Gate Actuator.
Full air and fuel system clean.
Replace the air and fuel filters there maybe a a gauze filter at the injector pump.
Replace the oil and oil filters.
Clean the MAF.
Clean the crank postion sensor.
Test injectors.
Test turbo and make sure it was boosting properly.
Adjust the tappets.
Clean out and pressure test the Intercooler.
If your Patrol's sluggish then doing the above would be a good start.
I have been told the Injector Pump is a common problem they generally fail early around 280k.
A lift pump after the tanks would assist fuel pressure.
When you fix your problem let us know how?
Good luck.