Idling issue

[louisq90]

Good afternoon,
Im having an issue with my 99 Altezza. Altezza idle jumps around when at idle temperature.
* Clean the MAF & throttle body
* Tested Coils
* New timing belt and water pump
* Good Fuel pump and filter
* Checked fuel injectors
* No vacuum leaks
* Tested Coolant temp sensor

Weird thing is the the only codes i get from the ODB II is 21 and 28 which are the o2 sensors.
But from reading a few posts, the o2 shouldn't cause idle issues.
Any help will be greatly appreciated.

* Can it be the MAF even if i receive no CEL?

[ThatGuy]

Check the throttle position sensor voltage, there a thread either on here or the altezza club of NZ on how to do it but it seem loads of people have been having this problem recently including me

[louisq90]

Yes, that was the first thing i checked because many people were having the issue. I adjusted it to .78.
When i disconnect the MAF sensor the idle issue goes away and runs fine.

[ThatGuy]

So does it only idle hunt when the maf sensor is connected? It could just be a dodgey sensor then?

[j2jedi]

Might be that the OBD-2 port (which works as OBD-1) does not give the information you're looking for.
I'd go with the last poster