Last week my F150 started to experience some issues. Started missing & check engine light came on. I got it to a shop ASAP. The mechanic said #7 & #8 were missing badly. He suggested replacing All the Plugs and boots & checks the coils, 7 & 8 plug was fouled. The mechanic said he suspected that a Fuel Injector issue was starting to develop. He suggested that I run some cleaner, I did that. The fuel injector did go bad and by the time I got back to the dealer, I am told that #7 cylinder was vapor locked with a bent rod! Now I am told that they must replace the motor at a cost of $8K! 
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Service Rep says he has had NO LUCK rebuilding the 5.4 Triton after a Fuel Injector problem and Vapor lock!
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What I need to is this dealer service rep trying to RIP ME OFF? 
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Can this be rebuilt? Any body have a SWAG on cost to rebuld?
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Any info would help.
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THANKS