In a previous post I stated that my RR was due for a rebuild. Well it wouldn't hurt, but I got her running smooth again. After thinking about it, I realized that a couple years back I bought some aftermarket 7mm spark plugs, instead of shelling out 2x as much for the OEM ones. They worked fine, up until now. I decided to simply swap them out with the old OEM ones that I kept (yeah I'm a pack rat), but as I pulled them off the rover, something very odd was occurring. The outer spark plugs 2, 8 and 1,5 seemed fine, everything was nice and clean. The inner spark plug wires 4,6 and 1,7 were very difficult to get off. Turns out there was corrosion that was sticking the spark plug to the lead, one was so bad that I couldn't get it off and the below picture was the result. It was really strange... I have no idea what could have caused this. There was no corrosion on the previous set of spark plugs either. Needless to say she is running much better now. My question, what would have caused this? Its bizarre :-?.