2001 sable

Woke up this morning and i started the car to warm up in the garage with the door open. Went inside and 3 min. later the smoke alarm is going off in the garage. Open the door and the car is smoking out of the exhauest pipe oil smell real bad and the car is running rough.I shut is off and cleared the smoke started the car and it runs fine. Filled it up and ran to do arrions and it spuddered and ran like S#$%t for a few secondes then it ran fine. Anybody have these effects to there car. No coade were showen or held i checked with my ODB 2. No lights eather.

Any help.

THanks

Stanton