Truck will turn over but won't start?
 

Hey everyone, I thought I was almost finished getting my truck in working order, until I tried to start it. I started it about once a month, and It needed a charge each time, but it fired each time no problem. Now it turns over but won't start. I can hear it sort of trying to fire, but nothing. Which is odd, because it ran once today for about 5 minutes. I know its not my battery, or my alternator. I should tell you guys that I have had the truck about 8 months, and never put any new gas in it until today, when I put 5 new gallons in it. A mechanic friend of mine told me it is most likely varnished gas, and that I just need to run the truck to burn it all out. I tried starting fluid in the throttle body, but nothing worked. Any ideas? I replaced all 8 spark plugs, and it started, then died when I tried to rev the engine. Could it be bad gas?
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If it didnt start with starter fluid then it wont be bad gas. The ignition is not firing. Whats the year and model?

1993 K1500. Are you sure? Becuase like I said, every time I get clean plugs in there, it fires up the first or second time, pretty easily.

Take a plug out and see what it looks like. If it s black or brown. Do this after trying to start it.