Need help doing a tune up

[FAT TONY]

alright well my truck has been acting up lately, I changed the water pump and gave it an oil change a couple weeks ago and ever since then its been misfiring and not working properly, it's on for a couple minutes then ether it turns off on its own or i turn it off then when I try to turn it on it turns but doesn't turn on it sounds like it isn't getting any fuel to the carburetor so i tried starter fluid a couple times but that didn't work, so im guessing there might be something wrong with the carburetor .........and when i checked the spark plugs and they were kinda black, from what i know it is probably the carburetor that isn't adjusted right but then again I don't know what is the correct way to adjust it so it gets the correct amount of air/fuel ratio, and i took it for a test drive yesterday and it turned off on me a couple times in first gear .. and even when i tried pressing the clutch or putting it in neutral it would still turn off........ at almost every stop when i tried taking off in first gear it would have trouble kinda like if it was in a hire gear but i know it was in first, so if any one can help or has any ideas of what i can do id appreciate it