Here may be one reason it runs like garbage:

It's got a garbage Prime Starter.

One of these are not like the other:

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You can see completely missing parts, and even broken parts.

And below you can see the fixture that the above goes into, and it gots different screws holding it on! Someone been in here, and someone dint put it together right. But still, this is only a "Primer", and really only is needed during cold start. Still, when the motor is running it could be letting in too much fuel. Perhaps one reason it runs like gargage. But wait for it, there may be more!!!!

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And here's the video of it running like garbage in case you dint see it: