Engine skipping and car stalling

What is your question?

I love my 2001 Santa Fe but recently I have been frustrated by skipping and stalling. What's worse, this is unpredictable. I've had it to 3 different mechanics: (We're traveling.) #1 installed new fuel filter. #2 installed a new camshaft sensor and #3 replaced the fuel pump. So far it has cost me $600+ and it's not fixed! The car ran fine for a week or two after each repair but the problem returned. It is especially unnerving when the car dies at a stoplight and won't start right away holding up traffic behind me. As I stated earlier, this doesn't happen all the time so diagnosing the problem has been a problem! Any advice is greatly appreciated. Joe H