I have a 98 Taurus with the 3.0 liter with 187k miles. I had a cousin to change the plugs an he asked me if I have had to added water to the coolant (and I have) he said one of the plugs looked like it had water on it. He said it is very labor intensive and he advised to sell while its running good. Anyway he acted as if was not worth repairing at this time and I should look into a newer vehcle. Thanks for any advice.