general problems of the 1999 Chevrolet S10

The problem usually appears in the summer, and rarely occurs during the winter. It started back in June of 2012, occurred several more times before the end of the year. Then starting in June of 2013, it began acting up an average of once a week until August. When it acts up, I will be driving, and the truck will buck a couple of times and the needle on the tach will jump up and down, and usually some of the warning lights will flash on and off and the doors try to unlock. It basically acts like the ignition is trying to shut off but gets flicked back into the on position. It will usually have a couple of episodes where it will do this for a few seconds and then run fine for a little while. When it does this, I usually have enough time to pull off to the side of the road to shut it off and let it sit for a while, but there have been several times where it dies immediately. When it dies, I have to leave it in neutral and try to coast until I can pull off onto the shoulder. If I try to restart it while in neutral, the steering column locks, which could cause me to veer off the road, and when the truck is off, the airbags won't deploy. I have taken it to 6 mechanics, and none of them have been able to find the problem. I have heard of other s-10 owners having the same trouble, and in light of the recently uncovered issues with gm ignition switches, I thought I should report my issue.