What causes the engine to not idle or cut off when stopping?

What is your question?

I replaced water pump and timing belt and removed the battery from the car during this repair. When the job was completed, the car would not idle on its own. Test drove the car and it performs well, but when stopping, the engine cuts off. Codes 1682 and 1684 were the only codes in computer. Did completely disconnecting the battery have anything to do with the car's failing to sustain idle?