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and it happend after i changed spark plugs

  1. Malibu 2008 3.6 ltz loss of power and jerking

    Gen 7 Do It Yourself Maintenance
    Loss of power and jerking while driving it started as a bad o2 sensor now it says its a catalytic bank 1 posible causes 1savere vacume leak 2 engiwn failure 3 bad catalytic converter what should i do first