So I have a 2002 Chevy 4x4 k&n cold air intake blah blah blah but some times when I'm feelin froggy and hanmer on it it will poof a little black smoke not a hole lot but just a little that I can see so my question is what makes it blow smoke like that I would understand if it did it all the time but not only sometimes so any help y'all can help me get would be awesome.
Thanks guys

gas or diesel?

If it's diesel it's the nature of the beast, actually it's unburnt fuel exiting the tail pipe. If it's gas, it's probably a problem, never seen a gas motor do that. Best of luck

Its a gas sorry bout that I'm thinking its either running a little rich or the throttle body or injector are dirty Or dirty cats

If you could drive around and watch the tailpipe of cars when people mash on them it might surprise you what comes out. Carbon? Running rich? Oil blow by the rings? who knows. If the trucks seems to run fine I wouldn't worry about it.

Change your plugs or at least check the gap on current ones

with out knowing the rest of the "blah blah blah" part, I would tell you
you are probably experiencing a temporary over rich condition at throttle tip-in
due to the pcm attempting to compensate for additional air charge.
ck engine light should be on?

Don't know much about these contraptions today, but on older cars, black smoke carburetor needs adjusting and Blue smoke rings/engine. As a tune up, I used to hold the throttle open and drizzle water down the carb to help blow out the soot.