Thanks! I'll change the plug wires at the same time as the plugs. They appear to be original also. Optispark is doing its job, though--never misses a beat and 23 mpg on the highway.
Why is there a light sensor on the front of the mirror? Does that option do anything besides dim the mirror?
There are two light sensors on the mirror, the front one is for ambient light and the one on the top of the mirrored part is for the light behind you. The mirror does a calculation between the changes in light gathered to dim the mirror.
Make sure the vacuum lines to the opti are good, they help dry it out. As for the plug wires, the drivers are pretty easy, passenger well be prepared to cuss alot.