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Q:

i get multiple cylinder misfire code on 1996 Buick Riviera

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
checked all plugs, wires and coil packs they are fine, O2 sensors and mass air flow sensor are also new as well as fuel filter. now it is smiking bad from exhaust, and oil drips from mufflers, rough idle revs and stalls
(1) Answer
possible intake gasket leak, fuel pressure regulator, or ignition module