When i get on it my car puffs out some black smoke then clears up and then when I let off it smokes again. what could this be? I was thinking piston rings but now im thinking possibly valve seals? what do ya'll think?

 

Sounds like your running rich and need a tune....

 

Running rich. Get a tune and that will fix your problem.

 

black smoke rich
blue/gray smoke oil
white smoke coolant

If that's happening, your bumper will show some carbon on it. It'll also wreck your paint there too. Ever see those riced up fart can ricer type cars with yellowing spots near their tailpipes or excessive blackening? Fix asap.