GMC Repair: 5.3 v8 missing, chevy tahoe, dielectric grease

Question
I have a 2001 chevy tahoe 2wd auto with 5.3 v8. approx 160k Just recently check engine light came on showed cylinder #4 misfir. I check the coil wire,fine  plug,fine so i replaced the ingnition coil. the miss feeling went away for a day but is now back  no sevice engine light on    ??????????

Answer
I had a minivan with the same problem in my shop last year. Turned out to be slightly corroded plug wire ends. Get a small round wire brush, clean all wires at both ends, brush off plugs, and do the coil or coil packs as well. Finish up the dielectric grease in the wire ends. this will displace the moisture.