Wil Beck

So I got the motor in my 98 civic ex and it was running alright, but yesterday morning I went to leave for work and when I turned the key it sputtered a little then died, then after I turn the key again, it turns over and sputters a little but I think at that point the engine is flooded, the weird part is the night before it's started right up with no problems, I've replaced plugs, wires, distributor, rotor, cap, and neg battery cable (clamp was stretched and a little loose), all the grounds are good. When it ran, I would get very little power until about 2500 rpms then back to normal so timing is probably slightly off but no detonation or anything, I've tried adjusting ignition timing too and it still won't start but correct me if I'm wrong but since it started and ran then timing shouldn't be the issue right? I honestly don't know what to do at this point, any help is greatly appreciated