So I recently bought a 2002 montaro sport 3.5 and it slowly began to run bad (trouble starting,bad fuel economy,gas smell from exhaust,bad loss of power,and a real rough idle) so after a few days I ran the codes and it has 2 misfires so I started at the basics go repair it I changed the plugs,plug wires and all 3 coil packs and it changed nothing now I'm out of ideas on what else to do and can't afford to have a garage look at it does anyone have any idea's or similar problems they can help me with?