Hi,

I just wanted some expert opinion, I had a engine code which indicated 6 cylinder misfire some time ago. So my mechanic changed all the plugs and switched the coil 6 to coil 4. Finally after that it was driving well. Now just the other day I mixed premium 94 Oct and regular fuel 87. It started running unsmooth and then check engine sign came up. This time the code was a misfire in the cylinder 1. Now I dont know if just the fuel mixing is the culprit or if their is a bigger underlining issue. Should I have the coils replaced or what. Please advise. Anytype of input is greatly appeciated.

 

Replace the coils. This probably should have been done with the plugs.
Once the V6 coils start to break down, they all go.

 

Ok, that's what I thought too.,Thanks FJT.