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Depending on the engine and your level of skill and confidence, expect to spend anywhere from 1/2 hour to 3 hours doing it. For hemis and magnums, you will definitely need either a true spark plug deep socket with its rubber insert, or an old spark plug wire boot to remove and insert the plugs.

On my 2002 4.7L Magnum (it should be the same process for a 2003 magnum or hemi), for instance, as a confident and fairly skilled DIY'er, it took me just over 2 hours (taking my time, not rushing). It also involved removing the air intake plenum, disconnecting some vacuum lines, moving some a/c lines, inspecting the things I uncovered, etc. Once that is done, simply unbolt each individual coil (one bolt each) and disconnect the wire to it before pulling it up and off the spark plug. Then ideally you want to blow or vacuum out the spark plug tube, remove the spark plug and vacuum the tube again (carefully so as not to knock debris into the open cylinder). Installation is the reverse process.

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