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2012 Kia Optima
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Youtube.com is a great site for this stuff. For example installing spark plugs on our cars...

HKS BOV install

You can knock out both in about 1/2 hour to 45 minutes. Good luck
 

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The ignition coil pack bolts are 2.9-4.3 ft-lbs. Couldn't find any torque specs for the plugs but i went with hand tight plus 1/3-1/2 turn. Also you don't have to unclip the connections to the coil packs. Just carefully back them out and place them aside. Pull one pack and plug at a time so there's no confusion on what goes where. Easy peasey. Don't forget to gap check them before installing them. .028 is where they should be at from factory.
 
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