please help our range rover sport cut off while driving if l put on everything works dvd,radii etc but there is no power have toed in to the dealer its been a month and half now and thy have not diagonise anything thy hav checked injectors thy ar ok ,timing belt ok.l am really getting .l only drove it for a week since l imported it from uk.

I think better descriptions of the syptoms would help.

Is the engine not running at all? ---------------------------
MY13 HSE Black Edition
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Santorini Black with Black Interior
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It's Very Black

the engine cranks but does not pick to idling point and it gashes out a lot of dark/black smoke.

Does it have a sun roof. If so, check for sunroof tubes blockage. That can lead to water entering the fuse box behind the glove box. Its the body control unit and therefore houses the immobiliser. If it actually cut out in motion, then its a different story. Diesel or petrol please

Sounds like it has engine oil entering the cylinders. Check oil level. If it above normal by a great margins. Pcv can damp fuel into the cylinders like nobody's business