hey i would like to thank everyone for their help i think i have found out the main prob it was the AFM the weight balance thing that moves under the cover was broke off and causing it too not be able for the flap to move freely, now it sounds so much better and no black smoke and the plugs have cleaned all up. But cylinder num 1 plug was a little damp not sure why?. anyways thanks again.
R.I.P. PAUL WALKER FAST AND FURIOUS FOREVER!!!!!