when i go to start it it turns over and over and then starts but after a few minutes it dies
See some suggestions >>>http://www.fixya.com/cars/t3953798-87_gmc_sub_runs_while_dies
Could be a fuel filter or fuel pump problem. Could be a vacuum leak. Could be a carburetor problem. Could be a lot of things. Have a mechanic check it.
This is a Simple Dialog Demo.