Had the car on delta dash today, lambda readings are fluctuating on idle from lean to rich. Also once the fans kicked in at 93 degrees. The engine spluttered and died.once some revs have been applied it's stays at rich/stoichiometric depending on load

Going to check contanuity from lambda to ecu, different battery and maf. See if I can narrow down the problem. Thinking it's either a wiring fault or the fans drawing to much current. Causing the car to stall

V5 sti with ecutek map from jgm. Car never did this before the clutch has been changed, any one had this issue before and able to shed some light on the issue

 

Anyone had this problem before?