I would say, just for testing purposes, do what I did and grab a heavy gauge wire and attach it from the negative terminal and then attach it to the intake of the car to give a good ground and try to start it. Both of my Fiero's had slight to major grounding issues. I added a permenant ground to both and had not had any troubles since.
My permenant fix was to buy another ground cable from AZ and attach one end into my negative terminal and and added a loop end on the other end and attached it to a bolt on the engine that made a good ground. Works great. Car runs smoother and EVERYTHING works the way it should. :-)
