Does anyone know what would cause a rough idle on a 3400? It runs fine other then that but it was throwing a code for bank 1 lean, and purge control valve. I've changed the FPR, IACV, spark plug wires (Borg warner brand), changed ignition coils, ran B12 through it, llugs are AC DELCO IRIDIUM'S with less then 40, 000 miles on them. I've checked for vacuum leaks the best I can but haven't heard or seen or felt any. And I replaced the MAF. I'm at a loss for ideas.. It's suckjng gas bad too..
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