01-21-12, 05:39 PM
My 2008 STS V8 (57K miles, extended warranty) has had 2 coils replaced in less than a year. The car starting having a rough idle this week and Check Engine Light came on. Took it to the dealer will know Monday the diagnosis. If it turns out to be another coil, is it reasonable for me to request they replace all remaining coils? Can the coil failures be attributed to bad wires or plugs?