I have a 1994 Chevy K1500 that is making a weird nose when barely pressing the gas, or letting off the gas while driving. It starts to spit and sputter then evens out and is okay. Sometimes when I'm in reverse going slow it is sputtering and will shut off but turn right back on. What could it be?

those are known for fuel injection system failures. Have a pro check that first with his scanner and years of experience, especially if is has the old fashioned fuel injection system and not the modern multi port system

Is there a way I can send you a video of the noise so you can hear?