In getting ready for the towing season, I took my F-150 pickup in to the shop for a tune-up. I was shocked to get a bill for $1,200. The mechanic said that was because the sparkplugs were seized and he had to take the heads off to get them out. I have known, trusted and used this guy for 20 years so do not doubt that he did the work - but is that unusual? - Ivan in Brighton, Ont.