Kdids82

I have a 1999 camaro and it has the 3800 series V6 with a 5 speed tranny. When I start it in the mornings or just on a cold motor, the entire motor starts to shake back and forth without stopping. It sounds like a spark plug went when I put my foot into it but that's not the case. The check engine light will also start flashing. Smoke will start to come out of the intake area and from the cat converter and it's a white color. It will stop once the motor heats up and it'll run fine. Can anyone help me? Thanks!