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I assume we are talking black smoke here?

agree with everything above, to pick up on a bit more what threedogs said, as well as the well known boost issues with these engine, if you have a boost...

Do you know what boost you're getting??

G'day mate. Try to clean the MAF sensor. That will be your cheap start to eliminating potential problem.
Just Google cleaning ZD30 MAF or search this forum. A ton of info on it.

Could be anything from a dirty air cleaner to a warning of a disaster. Have you changed your fuel supplier?. I would check air and fuel filters first up.

Hi mate no harm done but can you pop over to
the intros ,just something the forum asks of us all,
polite and all.
As for your problem try swapping your ECM relay with the air-con to test
{under...