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Q: P0300, misfiring, running extremely rough on 1997 Ford Thunderbird

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
I have a 1997 Ford Thunderbird, running rough and nearly stalling, but it stays alive. The trouble code is P0300, but that's the only one there is, no others are stored. I checked the plugs, they are carbon fouled slightly and very very slightly oil fouled, but they are otherwise good. The coils are putting out a healthy spark, battery is good, and the wires are all in tact.

Any ideas on what could be my problem?
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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I can't get a proper diag if I can't drive the car, and that's the only code being put out. Fuel is being delivered, and I'm working on checking the compression, but that's all I have so far in terms of updates.

EDIT: I have tested compression, and it was within spec. I found a vacuum line that was split in three places so I'm going to replace that and try it. It's only 1/4" but weirder things have happened.
Just wondering if the vac. hose did the trick on this problem. I'm having the same issue, but don't see any vac hose issues. Been running well enough to drive, but skipping periodically. Gets bad at times, then fine for a bit. P0300 code right now. Before I cleared it I was getting P1131 and P0131 (o2 sensor, which I believe is fine).
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