2000 Chevy Malibu DIFFICULT DIAGNOSIS

MY MALIBU WOULD CRANK BUT NOT IGNITE, EVEN WITH A HOT SHOT. THE ONLY PREVIOUS PROBLEM WAS THAT OCCASIONALLY THE ELECTRIC WINDOWS, A/C, AUTOMATIC LIGHTS, SPEEDOMETER NEEDLE AND FUEL GAUGE WOULD NOT WORK FOR ABOUT TWO MINUTES UPON STARTING THE CAR. I HAD THE CAR TOWED ON A TRUCK TO A GARAGE AFTER NOT STARTING FOR A FEW WEEKS AND UPON ARRIVAL AT THE REPAIR SHOP, IT MYSTERIOUSLY STARTED!! ELECTRICAL DIAGNOSIS REVEALED NO PROBLEMS. MECHANIC THOUGHT STARTING PROBLEM COULD BE DUE TO FAULTY IGNITION SWITCH AND/OR AN ANTIFREEZE LEAK, BUT THERE IS LITTLE OR NO LEAK OF THIS KIND. REPAIR TECHNICIANS NOW WANT TO RUN A TEST ON THE FUEL PUMP. THE CAR HAS BEEN SITTING IN THE REPAIR SHOP FOR ONE WEEK, AND WE FEEL IT IS BECOMING AN EXPENSIVE GUESSING GAME, AS NOW THEY ARE ADVISING AGAINST IGNITION SWICH REPAIR. IT SEEMS TO ME, WITH THE CAR'S PREVIOUS HISTORY, IT IS PROBABLY ELECTRICAL MALFUNCTION. I AM CONSIDERING MOVING THE CAR TO ANOTHER REPAIR SHOP, BUT DO NOT WANT TO GO THROUGH THE ABOVE SCENARIO A SECOND TIME. THE CAR CONTINUES TO START WITHOUT PROBLEMS AT THE SHOP.