I just swaped out the tranny and motor from a 351w to a 400m.. the new stuff is rebuilt 40k ago and now im dealing with the only issue i have left and that is it dies in drive or park. but it drives excelent if you keep on the gas and breaks. any ideas? i heard a few but i need to get this truck up and going.... This truck has no smog. new exaust for back preasure. new truck avenger carb...