VL HOLDEN with NISSAN motor idles and runs very rich,have replaced air flow meter with no differance?

You may possibly need a new injector or spark plugs. When was the last time it had a tune up? How many miles on vehicle? Autozone has a diagnostic module you plug in to your vehicles ecu and its free to use. I would check these things first. Did you unplug battery before installing new maf? Not trying to insult your intelligence just want to help. Please message me back with more info.