Pontiac Repair: Engine stalling on 98 grand am, throttle plate, tail pipe

Question
QUESTION: The engine stalls when i give it gas or when I'm braking, the rpms will drop then the engine will quit running but will start right back up, any ideas?

ANSWER: Hi Vernon:

what engine is this? do the rpm's fluctuate a bit up and down before it dies out or is it like someone just turned the ignition key off?


---------- FOLLOW-UP ----------

QUESTION: 2.4 L , yes it does fluctuate between 500 and a 1000 rpms before it dies. then there is black smoke coming out the tail pipe.

Answer
I would start by cleaning the trhottle plate and throttle plate bore. along with the idle control motor on the throttle body. disconnect the battery let it sit and reconnect the battery and then see what happens. Has any service engine soon lamp come on?