Truck will start then start to drive then it shuts down

Hi,

I bought truck in Summer, I live in Vegas and the truck shut off would not go but it was 104 degrees outside.
Now it's wintertime and the truck has been running great.
I went to get in it one morning I didn't even make it to the end of the block. Truck shut off, would turn over but not start.
Let it sit for 15 minutes then went to start it again same thing trying to start but it won't turn over and then all of sudden thick white smoke starts coming out from under hood.
We opened the hood and could not find where it came from (smoke).
I have replaced Fuel Pump, Fuel Filter, tune up and more.
Bought brand new battery.
Spent over $500.00 and there it sits in my driveway.
Same problem.
We have replaced fuses and checked wires.
We can't see anything.
wrong
My neighbor's friend was outside a few weeks ago o he's a mechanic and he looked at it for me, he said "it's not getting a spark ". That could be several things.
I have $3,000.00 into this truck and don't know what to do?
I don't want to keep putting money into it and then still sitting there.
I can't seem to get a answer of what is the problem so I'm reaching out to you, someone a Chevrolet Mechanic for help.
I see I have read some postings from people that have had a similar problem with their Chevy S10.
But no one has come up with a real specific answer to the question. :(

What it can be?
What can be causing this issue?
What can be done to fix it?

If someone can help us, talk with me have some advice
We really would appreciate the help!
Please reach out to me if you have some ideas of what the problem is.
Thanks for your time and reading this posting!
Signed from
"Stuck like Chuck with my Truck in Las Vegas "
Ha ha lol
Leanani and Mark