i was reving me EB XR6 Auto the other night to show off me note to a couple of mates, i was reving it to about 4500 - 5000 pumping it and i took my foot of the accelerator and the cars revs just died all the way down to 0 revs

and the whole cars lights dimmed then the revs jumped back up to idle i repeated the reving 2 more times at lower revs and it did the same thing. it has a little bit of a lumpy idle aswell and every time i start her she seems to smell excesively fuely out of the exaust... ohh it also have a rooted auto tranny in it.
any help at all would be much appreciated...