Your jimmy will not start when it is cold if you put a shot of starting fluid in it starts up and runs and if you shut it off it will start right back up then when it gets cold it wont start agane?

fuel pump may be getting tired,fuel filter could be plugged, fuel pressure regulatormight be bad or not getting vacuum. check fuel lines back to the fuel tank and around the engine. sometimes there are plastic lines from a fuel distributor on some of those engines inside the intake manifold going to the injectors that can crack,break, and leak. might be something with that.hope that helps out. good luck.