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2000 Chevrolet Suburban 1500 Question: Suburban - P0300, P0420, P0430

 

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ALH, Lakeland, FL, November 18, 2010, 05:27
 Rookie

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?

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