when u keep the throttle at 3k then suddenly shut it off the injectors stops injecting but the motor keeps on spinning to clear out the chambers

 

im gonna guess you put ATF in it, ATF smokes like a bitch! don't mind everyone who sais it's blown, if it smokes white puffy smoke every time you start it up after this smoke is gone then i would say you may have an issue.

 

it took 25 minutes of hard driving to get rid of ALL the smoke from my car when I put in ATF one day..