86toyotaprerunner14

I Have a 1986 toyota pu with the 22r. It has Rochester Twinjet carb on it and resontly it would start butt it would only run for a minute or so. Then it would shut off and not start until the next day. I think my fuel pump her my Carb acting up but I'm not sure I can't think of anything else it could be. What would cause the issues it has perfects spark and timing please help.