I dont know if this is problem with gas from Costco. Lately i was filling my tank in all of my cars at Costco gas station and recently around december engine light came on in one of my cars. Normal driving and suddenly its like iam losing power. Car RPM goes up and down around 1000 RPM while on iddle. Dont have any clues what is going on. Suddenly in my other car malfunction light came on too. Is this Costco gas problem quality or whatever?
Thanks