My 1990 Accord LX has been sitting undriven for about 2 and a half weeks with a for sale sign on it. A guy came today to look at it, he turned the key and it took a few seconds longer then usual for it to start up. So we went on a test drive and it drove perfectly fine,...then he turned on the heating/air condition full blast to test it out...within a 2 minutes of him doing that, the car cut off while backing it into the driveway. Now it will not start at all. It cranks up like it wants to start but will not start up. I just replaced the Main relay which every one on the internet says is the main cause for this problem...and it still will not start. I just charged the battery with some jumper cables, now the lheadlights and all lights indside are nice and bright but it still doesnt start. I noticed that when I turned the heating/air condition ON it would make my cd player cut off, almost like it was draining its power or something. Now that I charged the battery with jumper cables it doesnt seem to be doing that now. I had someone listen at the gas cap for the fuel injector sound and that sounds like it is coming on. So ...does anyone have any idea what is wrong? The guy was just about to buy it until the f''''ing thing cut out!