I believe you take the old ones out and put the new ones in. I don't really know any other way unless you pay some one else to do the job for you.How to change spark plugs on a 2003 yukon?
get a 5/8'; deep socket, a 4-6in extension, a wobble and socket wrench
Driver's side will be easiest to access, pull and replace plugs one at a time to avoid confusing the plug wires.
On the passenger side remove as much of the air intake as possible to allow easier access.
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