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You may have a lower injector o-ring that heats up, and allows it to flood around it.
Running rich and REALLY rough? Like, not just rough, but has a miss? Pull the plug wires until you find the miss, get a set of injector o-rings and some vaseline to lube the new one to put it in, or it will tear, and fix it. (the ecu may already have an injector or misfire code, did you check? it can tell you the cylinder)
Or, an injector stuck, open or closed, or one that sticks both.
And yeah, it can be really hard to start with a bad injector, and can be really damaging to run on it. Don't be a fucktard, it obviously shouldn't be driven so it hopefully just fixes itself, ruining itself is a lot more likely.
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