I have two cel's..one for the blocked egr system, and one for the rear o2 sensor since my cat is cleared. well tonight i went for a cruise to the grocery store and clicked the ac on because of fog issues..then out of no where the cel goes off and doesnt come back on. How would the ac make the cel go off? the light has been on for two weeks straight. Any ideas? Ive been debating on a new clutch recently because of stuttering..but tonight without the cel there was no stuttering. Im just confused and need a few answers. Thanks in advance