After ten minutes of running it starts to spit and sputter cough and puke

My dodge dakota sport starts up fine. But after ten minutes of running it starts to spit and spudder caugh and puke. It doesnt run right its almost as its not getting enough gas or something. I put a new coil in it and tried gas treatment. Nothing seems to have any affect. After about two minutes of th bad running it will stall. It takes a few to start up but after that it wont start again no matter how much I turn it over. When left alone for a few hours it will restart but do the same steps I described again and again. I really need to know how to fix it. Right now its our plow truck for the winter. Its all in decent shape. But im going to be 16 and I want it as my first vehicle because I cant afford anyt other truck. Please I need help. Im sorry but I cannot donate.