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Q: Suburban - P0300, P0420, P0430 on 2000 Chevrolet Suburban 1500

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
K1500 Suburban with 220K miles. Starting to have some issues but has been a problem free engine for 10 years. Local mech. ran quick diagnostic - P0300 (random misfire), P0420 & 430 (Cat. Converter below threshold)
All good and well but his recommendation was to replace ALL of the coil-packs and plugs. - Seriously??
Prior to having test run, rough idle was occasional, check engine light was on, so I took it in. Since test, rough idle is constant and worse than ever. I can feel the misfire, sometimes bad, others hardly noticeable. Has not progressed to the point of stalling, but it won't be a surprise when it does. At 220K miles, I am not prepared to spend a fortune with a dealer/mech., but love this truck and want to keep it on the road. Can someone help me the "try this first" list of things to consider?
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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change plug wires and sparkplugs change converter put hi quilty converter on or you will have more problem with converter
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