on my 4.3 vortec with cold air kit it seems to stick in first gear then pop out the check engine light came on and i took it to auto zone to see wat was wrong and they said mass air sensor nothin about transmission.the check enginelight went off but i still cleanedthe sensorand the airfilter.could some one help me out with possible solutions to the problem.

 

miles-cat. conv. rattle? Jerry[&o]

 

I guess the year would be nice too. Jerry