Hi all I have a 1995 navara 3.0lt vg30 auto, it runs ok on gas but on petrol it has a bad flat spot or bogs down and at times may pop or back fire through the air box, if I hold it at 2000 rpm it can vary from 1500rpm to 2500rpm its like it finds the problem fixes it then dies off again, idle is ok just a bit up and down very minor, I put this motor in because the old one had water in the oil and heads tested ok found a small crack in the bore so out she went, it still ran ok and did not have this problem even with water in the oil, just came back from mates who checked the codes there was a air flow code but after we cleared it went for test drive came back and retested it there was no codes but still runs the same.