Lost all power and sputtered, then shut off?

Hi! (I wrote one of these then my computer glitched and I'm not sure if you got the first one, but this one has a bit more detail anyways. Sorry for the hassle if you got two messages from me!) So, I have a 2016 Dodge Ram Rebel, that I have put an 8in suspension lift on with 37in Tires etc, etc. It has been causing me issues ever since I got it back from the place that put the extras on for me. It seemed to be running well after a couple trips to the shop but last time I was just driving up a hill and had no warnings of anything wrong and it just suddenly sounded like a Harley revving up when I touched the gas and it lost all power and sputtered, then shut off. I managed to get it home where I've been able to start it a couple more times and it would do the same loud backfiring kind of noises and then sputter and shut off. Now it won't start at all for me. I live in a tiny town and our last mechanic jumped ship so I have no one to look at it for me and I don't know what to do and a tow to the city will cost me $1000. I hooked it up to two different diagnosis computers and they both said "random multiple cylinder misfire" and doesn't say which cylinders or anything else. I would love some advice and I will definitely donate! Thanks so much for taking the time to read this and I hope to hear back from you soon!

Allie