I have a 1997 Chevy Silverado C1500 with around 210,000 miles and automatic transmission.

This is kind of a long story so I am trying to explain it as best posible without being too long.

For quite a while I've had this problem of a hard start where I'd crank it and it would seem to crank normal but wouldn't start. After cranking it another one or two additional times it would start and once started there were no problems. Although sometimes even when it did start it would vibrate for a few seconds before it smoothed out the idle

Then, and this is the biggest problem., last September I was using it and it totally shut off while driving. It made a sound that is hard to explain that was loud enough that I thought something physically broke and I was looking underneath it but didn't 't see anything. 

I had it taken to a garage who said that there was no spark coming out of the coil and they recommended changing the distributor which they did.

When I got it back at first it was working but after a short time like less than 30 miles it shut off while driving again. I complained to them and they ended up changing the distributor again saying it posibly was defective.

It seemed to work after they changed the distributor the second time although it still was starting and after a second shutting off but once started it didn't shut off while driving.

I changed the ignition coil and after that got a code that I don't remember what the number was but it showed Ignition Coil High Voltage.

That's the most of it without making it too long.

Thanks for any replies