Low engine idle and codes P0332 and P0327?

So, about a month ago, I drove my suburban 800 miles towing a trailer. It quit running on me halfway through and a couple other times after. I made it the 800 miles, let the truck sit for a couple days due to a coolant hose busting. Fixed the hose, then I got a check engine light for a p0332 code. I drove it for 2 weeks and it started low idling and shutting off on me. Took it to the mechanic to have him replace the knock sensors (AC Delco) and intake manifold gaskets. He replaced the knock sensors, but the gaskets were the wrong ones. So, I drove the truck and the next day the p0332 code came back with still a low idle. So, a week later, I got the right gaskets, took it to another shop and they installed them. The idle stayed at roughly 800 RPMs (before it was 550ish. But my check engine light was still on for the same codes. Drove it home and cleared the code with my code reader. The next day, the code was back with an additional p0327 code. So fast forward to last night, went out to drive it, started up, idled for about 2 minutes, threw it in drive and it shut off on me. Started it back up, drove it 10 minutes, shut it off and let it sit for about 3 hours. Started it up and it immediately shut off. Eventually it started up after dying about 3 more times after that. Still having the two codes now.