I have a 85 subura gl wagon 2 wd from a junkyard it started and i drove it into my garage. im using it in a destruction derby . so the inside is stripped and welded well now when i start it it runs for about 15 seconds then dies. It acts like its out of gas but it full, my buddy thinks it might be the choke. If so i have never worked on a this kinda car, and if not any other ideas.