Yeah, I had he same problem. Turned out to be blocked injectors. B.T.W. Don't get an onboard injector clean, they don't last for very long, get the injectors rebuilt. Some original photos have not been recovered yet.

Hay i got another AFM from a mate and did the trick, shes runs beatiful now.

I had a similar problem to yourself. I took my car to the mechanic and was dreading the worst (afm, cas or some other sensor) the culprit was a loose hose. I have highlight the hose on the attached pic. Seemingly it had worn thin and was slipping off the engine. They replace the hose and glued the fittings tight with sealant. The car runs like great now, idles perfect, and doesnt drink all my fuel Some original photos have not been recovered yet.

yeah ive double clamped that hose on my car.

I've also just found the culprit of a similar problem on my car. The timing belt on my car was the original (180kms) one, which had stretched slightly, and was wearing thin in a few spots. The bearing in the idler pulley was also stuffed, and this combined with the worn belt was giving a variation of around +/- 10'ish degrees at idle! Replaced the pulley & belt and I now have a nice steady idle.... Might be worth getting a timing light on it and check the timing isnt jumping around at idle. Ta Damo