350 sbc qjet idle miss

  1. Need Help, "miss" on hot idle ???

    I've got a 65 Impala, with a 350 SBC, with rebuilt Qjet. Recently installed used Vortec heads, headers, and all was well for a year or so. Car has developed a "miss" on one cylinder, only on hot idle. Runs fine at higher RPMs, and idles fine with cold. But once engine gets hot, idle develops...