Another dealer horror story. Yeah, I feel the pain, an oil change at the dealer almost cost me an accident. The mechanic, while checking the air filter, clipped off a piece of the air filter flange and it lodged in the throttle body, holding WOT. Luckily, I was on clear road with no traffic. If it would have happened in traffic or in a parking lot, I would have been classified as one of those old farts that forgot which pedal to push.
I know my way around engines but will let Ford handle the plugs. I've found it's incredibly hard to bs an old bs'er, so they better get it right.