[kurtr]

Greetings:

I have a '98 Windstar that appears to being using (not leaking) coolant. I filled the resovoir last weekend... now it is empty. We've noticed it running rough on occasion (like it is missing on one cylinder). Yesterday it was running rough and the exhaust was thick, white and smokey. I pulled the plugs today. #6 looks a little different than the others. It had more crud and looks like some of the metal was eaten/burned away (making for a larger gap).

(Regarding the coolant loss: I filled the radiator AND the resovoir 7 days ago. Today the resovoir is empty, but the radiator is still full. I would estimate I have lost about 4-6 cups of coolant.)

Any thoughts? Your ideas are greatly appreciated.