my 3 hours old omi 2,5 v6 automatic has no power at the train help…

Hello after a long time, I bought again an omega after I had enough vectra drive. I had a diesel 2.5 td and now because of fine dust a 2.5 v6 1998 automatic with d3 bought v or about 3 hours. when I give gas comes simply nix and from time to time he pulls then as he should and is at the sottern like crazy puff is a bit leaky but that can’t be…. on 230kmh I was just on the track and until then has taken forever switch does the gear very well… achso 125 tkm run…..do you have a idea???? thank you in advance