Vehicle ran fine then suddenly would not excelerate and we pulled over. vehicle will start and idle fine but when you hit the gas pedal it sputters and backfires and dies. Will not bmove under its own power for more than a few feet.

You may have an issue with the MAP sensor if this is an EFI engine. This part of the car dictates the fuel that is injected into the cylinders. It could be faulty. You may also want to check the fuel supply for your car. You car may not have the correct supply of fuel if the fuel filter is clogged and needs replacing. This can be true to carbs and EFI engines alike. For EFI you may also want to check the fuel pump if it provides constant supply of fuel. It may be weak and may not provide the correct amounts of fuel during acceleration.

For carbs, you may want to check for leaks in the vacuum hoses and the jets if they need cleaning.