If you have good spark at the plugs, unless it is dumping so much fuel that it can't fire, you should get something, even it is a backfire. Pouring in additional fuel and starting fluid may have compounded the problem if it was flooded to begin with. The flooding condition, if it existed, should have evaporated over night. The only thing left is compression.

Frustrating

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I really gets fun when they all don't run

84 500SL
99 Jeep XJ
93 Jeep YJ
03 Custom Softail