1996 legnum vr4 running rich and idling low

[NoominsVR4]

I have a legnum vr4 with 279,000kms it’s starts well but seems to be running rich and a a bit smoky at idle and idles at around 400-450rpm when it’s warmed up, unsure what’s causing it but I’ve considered it could be the injectors or the o2 sensor since it has its original injectors.

 

[Legnum in America]

I have a legnum vr4 with 279,000kms it’s starts well but seems to be running rich and a a bit smoky at idle and idles at around 400-450rpm when it’s warmed up, unsure what’s causing it but I’ve considered it could be the injectors or the o2 sensor since it has its original injectors.

Have you found the cause?