This vehicle needs a tune up, new spark plugs, maybe new spark plug wires. It may be out of timing.
I would also add the plug wires may be installed incorrectly.
It's lean.
It's lean.
what does a 1989 Chevy s10 Tahoe 6 cylinder get in gas mileage
It's lean. You have to figure out why.
15 to 18mpg
That usually means the engine is lean. Could be a vacuum leak.
Possibly the ignition got wet, check inside the distributor cap for moisture.
I believe I get around 22 mpg
That usually means it's lean. Check all vacuum lines and gaskets for leaks.
a bad wire or a bad coil to cylinder 5.
i get 16 to 18 depending on the traffic and that is about 20 on the highway
Backfiring is usually an indication of a lean condition. When it does it during cranking, it's probably timing related.