Pulled and clean o2 sensors nasty buildup on them pulled cleaned regapped plugs only four months old ,checked wires coil packs cleaned maf sensor fill tank with bp 93 and two cans of seafoam,drove out half a tank woow no misfires and a little stronger.My tailpipes still look a tad bit funny purple blue hazy white guess that burning off the cat converters, going to run another can of seafoam,otherwise car is running great.