Hi Guys My Vitz Turbo 99 1SZ-FE is playing up on cold startup the idle irs normal till it warms it becomes very rough engine shaking like it wants to stall but never does,driving around seem fine just when on a stand still its rattling bad ,suprising no engine light comes on i,Have changed sparks,oil ,oil filter ,clean throttle body ,I have checked the PCV Valve does make a rattling noise so maybe its fine dou the oil is blackaz in that hose to the pcv vavle I have changed the pod filter and clean the maf sensor still no good .Cant find any leaks. OBD2 will be great if someone had one could test if for me for hidden error codes in .
Things I have not checked (Electrical ,Multimeter)
Maf sensor
Coils
O2 sensors :