99 GMC Sierra idles out and dies while driving?

A couple days ago when we received some very cold weather ( I live in Canada), my truck had a hard time turning over, when it did, it ran for a bit then idled out when warming up. I restarted it again (after about 5 tries) and it seemed to be fine, minus some unusual shaking and clunking.

It got a little warmer the next day and ran fine (drove for about 80 kms) with no signs of issues.

However, yesterday I was driving down the road and it just slowly died out and wouldn’t rev above 3000, it was like I had run out of fuel. After about 15 minutes of trying to start it, It finally turned over, and it started up fine, but it wasn’t revving above 3000 and when I would get it to about 6 I would have to slowly ease it right down or the revs would drop and stall right out. If it tried to put it to the floor it would rev for a second and completely drop down and idle out. It idles around 500 but dips up and down and never really stabilizes.

I put 3 bottles of gasoline antifreeze and a full tank of premium grade fuel. I ran it down the highway and all the gears were shifting at the right time and everything seemed fine. I let it idle for about 3 hours and it was fine until the last hour and it died again, now it won’t even start and of course my battery is dead from trying. It seems to run fine then out of nowhere it won’t let the revs go above about 3 grand and wont change gears, and then eventually dies out.

My friend thought it was from water in the fuel that might have frozen because that night I had like less than ¼ tank of fuel when it dipped well below freezing. My other friend said he put a fuel regulator in his suburban of the same year.

1999 GMC SIERRA NEWBODY 4.8 V8 2 WD 215000km’s

I changed the oil and air filter about 6500 km ago.

The engine light turned on the first time it died out on me in the middle of the road, so I’m assuming it’s in regard to the issue.

I’m just looking to see what some of the issues might be so I can personally diagnose it and, so I don’t get taken for a ride by the mechanic in town or if in fact I could fix it myself; possibly a fuel filter?
The truck turns over, but it like its not getting enough fuel or the fuel isn’t igniting or something. The starter goes but it kinda chugs then just stops, sometimes it will chug like two or three times but wont fire up.

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