The $8K estimate WAS from an independent shop. I just can't see sinking even half that much into a vehicle worth only $7K. It still runs fine, just leaks a little.
Lucky you!
Soooooo....the Expedition's CEL was flashing. Took it to a different shop. One of the coil overs was toast. Had them replace all 8, plus plugs. ..... We drove it for about 100 miles and they black lighted it.