attn technical guys
myo3 sti uk when at lights etc the idle is dipping and rising as if the iscv is trying to correct a problem
my question is no fault codes are showing but is it poss the maf is gradually failing or poss the lambda
i have had a faulty maf before in a p1 that wasnt showing a fault code
the dipping is only between say 750-1200rpm and just does it and corrects itself
which makes me think the iscv is working and is moving to correct the reading it is getting from somewhere else
car has had new injectors would a badly seated injector cause this problem
the fluctuation isnt constand but every few seconds
any ideas greatly appreciated..thks

 

My '99 classic did exactly the same.

Maf gone...