ok so i have got the engine back in my s2 turbo now, completeley re built, but it wont run, it cranks over fine, just about fires up on its own but will only fire if given throttle, and wen it runs it misfires and and runs horrible, and wont idle, i have put fresh fuel in it, changed the fuel filter, changed the plugs, leads, coil, dizzy cap and rotor arm, but still no good, exactly the same, i have changed the metering head for one i know is good off a mates car but its exactly the same, have noticed its stinks of fuel from the exhaust and the plugs are black as anything, just cant get it to run sweet, any help wud be greatly appreciated, as its doing my head

cheers