I like working on my truck just as much as the next guy, but I have always know breaking plugs or striping the threads is REALLY bad. My truck is at about 55,000 miles. Pretty sure the original plugs are still in it (bought the truck used from a dealer at 35,000). How much does it cost to have ford do the spark plug change? And if they break anything, will I have to pay for it? I know its a cop out, but I really need my truck in good running condition.