ok i searched but my problem isn't like the ones posted. i have a high compression ls vtec build up... i was running on stock injectors and when i took it to street tune it they put it my 370cc and my 255 fuel pump...at first the tune was going alright and then out of nowhere smoke came out so it was night didn't know what color it was. so we stopped the tune and i took the car home.. now today i turned on the car and it turns on fine and if you gas it constatly in neutral it not smoke will come out but if you step on the gas hard while its idling black puffs come out.....anyone know what this could be?

 

running really rich...

 

get a fuel pressure regulator witha gauge to find out how much much fuel is bieng dumped by those injectors

 

your car is running a little rich