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Hello I will help you with your question,
You remove the ignition coils first, there is just enough room to remove the back coils so work carefully
IGNITION COIL(S) REPLACEMENT REMOVAL PROCEDURE
INSTALLATION PROCEDURE IMPORTANT: Make sure that the ignition coil seals are properly seated to the valve cover.
Then you can remove the spark plugs
SPARK PLUG REPLACEMENT REMOVAL PROCEDURE
INSTALLATION PROCEDURE NOTE:
Only use AC Delco spark plugs
Please let me know if you have further questions about this