Barbara and Homer, Stalling or missing of an engine will usually set engine trouble codes. Some auto parts stores like Auto zone, Pep boys, Advance auto, etc. offer free diagnostic code reading. You can go there as a first step to help determine what the problem is. The staff at some of the auto parts stores are very knowledgeable and may able to offer good advice.
If no luck retrieving codes at one of the parts stores you may have to go to a good repair shop that have a little better equipment/ scanner that can read live data, which normally can pin point the problem with testing and diagnosing. Ask for an estimate on repair. Good luck.
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