What size engine do you have? If it is the 4.6 V8, the sparkplugs will be right on top of the engine, and each plug will have it's own coil. This engine should have a 100,000 mi tuneup interval. This is where the owners manual will come in handy as to telling you about scheduled maintenance. From what I have seen, the fuel rail and injectors will have to be removed because they are up over the coils, and blocking their removal. Also, half the engine is up underneath the firewall. Good Luck.
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