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Q: 2002 chevy express 3500 p0300 on 2002 Chevrolet Express 3500

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
have chevy van p0300 cap rotor wires new and plugs still has flashing mil 180 comp all cylinders misfire data cylinder 3 goes up quick spark tester says it is firing though only has misfire counter go up at idle long term ft 4 per bank 2 17 per bank 1 what do i do
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