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Original radiator had muck between the fins restricting airflow, new clutch fan centre and system flush has made heaps of difference.

Thanks all

I have the same problem in my NA TD42 GQ LWB. Need hand throttle to help moderate throttle overall, that way I can't let the throttle drop back too far to stall.

Ok, so I am low on cash, re-using my radiator as I reckon it was OK, it has been flushed.... Getting a Dayco thermo clutch viscous thingy for $160 delivered, Nissan ones are $300+. Trust Dayco stuff....