Why malu, its called ada gaya.My EX5 Kuasa Tinggi experience hard start and idling issues when cold if i'm using Petronas.
However your problem could be related to carburettor issues.get it service and change your fuel filter. I just solve fuel leak and engine backfires thru the carb problem by replacing the float and servicing the carb.its overflowing.last time had to set idling higher to avoid engine dies off at traffic light.
i wanted to try RON97 on the EX5 but shy to pump in...everyone at the station will be observing a guy pouring RON97 in an old kapchai.Maybe i have to pay at the pump using credit card.
Malu is driving Mercedes S400h and pump RON 95. Cheapskate.