What could cause vehicle to stall out while at red light, or slowing to make turns or in stop and go traffic?

For the last 2 months my Jeep has been stalling while sitting at red lights, or even if I stop at stop signs. I've taken it to 2 auto repair shops the first shop replaced the crank sensor, the very next day same problem of stalling. I took it back he replaced the distributor cap, same day it stalled again. Had the Jeep towed back to first shop after 2 days I called him, he advised problem was intermittent and if I wanted to come get the Jeep I could. I when and got it 2 days later, when I arrived the owner advised he replaced the ignition switch & cylinder lock, why I have no clue. He stated to drive the Jeep for a couple of weeks and see what happens. It stalled the very next day, fed up and frustrated I took it to a new repair shop. They replaced the coil, I went to pick it up and it actually stalled out in the parking lot of the repair shop. The guy came out started it up and played with it by changing gears while placing his foot on the brake and gas at the same time. Stated it was good to go. The very next afternoon while running an errand it shook then stalled out. 2nd repair guy called as it stalled I advised him of it stalling, he asked me to bring it back to him which I did. I called at 5pm he stated it was something electrical & he didn't know what it was. I went to pick up my Jeep it's sat in my garage since. I've read forums advising it could be the screws in the PCM, or possibly the throttle position sensor. Just at my wits end, as this was given to me by my who never had these problems?