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Information now points to fuel pressure or lean .
If frequency not set to 50% +/- 5 it will hunt at idle.
The missfire you describe is at low speed and this means that as pressure to the injectors increases, missfire goes away.
Could possibly be a bad injector to.
These motors are tough and I have yet to find one with a valve guide problem or pistons rings worn out.
I would be hunting for an injector or fuel pressure problem, although the fuel pressure seems okay if you are able to run rpm's all the way to 5+ k with good power.
There is faint possibility there's a burnt valve seat.
Try this.....turn the mixture up about 1/4 turn and drive ....if miss has gone, this indicates a bad injectors or very lean.
These motors do eat cams though......have had several in last year with no lobes on various cylinders.... but that usually make for a rocker tick.
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