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Only need three things to run. Fuel, spark and compression. If you have spark and injector pulse you might want to compression test the suspect cylinder. A leak down test with compressed air with the adjacent spark plug(s) removed wouldn't hurt either to verify no bad head gasket. Good luck
unimportant. use 1 hand and just snug it up. not real tight , just a little pressure past the stop. i never seen a spark plug wiggle loose, since the spark plug wire doesn't allow it to spin
i have a 01 optima v6 and yes i had to take off the back intake manifold and replace the gasket to change the plugs . the front cover comes off to change the other 3 plugs.
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