Explorer Eddie Bauer V6

• Automatic transmission
• 196,000 miles

For the past couple years, the engine will shut off randomly when I come to a complete stop. I took it to a mechanic that the family trusted and he fixed lots of minor things on the vehicle, nothing that fixed the big problem. I was then told to have him change the idle air controller, which he did, and that didn't fix it either. I pretty much gave up after almost $2K worth of work on the car. It would go for a couple weeks without ever doing it, and then it would do it every time I stopped. It was an inconvenience, but it would always start right back up. Now, if I get the car over 30 mph, it will shut off every time. I start it back up and as soon as I put it back in drive, it shuts off again. I have to sit there and let it idle and pump the gas, and sometimes put it in neutral, before I can get it to actually stay on long enough to get where I'm going. It's gone from inconvenient to dangerous. Luckily, I live close enough to work that I can take a route where I don't get over 30 mph on the way. Please help.