GU PATROL running ruff at idle.

Paul, the first thing to do is to check for any stored error codes. I would suspect your EGR valve isn’t closing properly. It should be code 1003.

Make a plate up and block the egr at the alloy pipe where it enters the inlet manifold as its easy to get to and then see how it is for a few days.
EGR valves are starting to become readily available from aftermarket suppliers lately as I received a flyer at my workshop last week. At least this will save some money for people.
120scruiser

you are now in the danger zone with this engine, 150.000 ks. we have had 5 in the last three months in the workshop, all between 145.000 and 170.000 ks. all destroyed, last one a valve broke off and put a hole in the piston and pieces found their way down the side of the bore . on inspection every piston was cracked, and the head had 4 cracks in it. these and the 2.8 are just simply bad engines. dont care what the rest say, i see it all the time.

the newer ones will have the same probs. at the same ks. nissan has not addressed the problem. big heavy car, small high revving motor, not up to the job. and the gearbox is not the same as the 4.2, so look for trouble there as well. best advice, make sure you change the timing belt before it is due. they can go at anytime. 100.000ks is recommended for timing belts, but with these motors, do it at 70.000 or 80.000 ks. dont tow big loads, and dont rev the poor bugger too hard. i know its hard to do as the turbo boosts at higher revs than others. just bad engines.