Put the wires back and switch the suspect plug to a different cylinder. 6 to 5 and 5 to 6 and see if cylinder 5 goes dead. Maybe you have a plug that looks good but is defective.

John

~ J Lucas
2006 GMC Envoy 4.2 I6
2023 Ram 2500/Cumins 6.7 I6
2010 Jeep Grand Cherokee (Wife’s)
2002 Silverado 2500 Gas 6.0
1941 Chevy 1/2-Ton
1942 Chevy 1.5-Ton SWB
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