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[-Lawless]

For those following along, I've replaced all filters, set timing and idle, and many many other things.
Car runs great at idle but over the last week or so I've been noticing the engine running really rough at about 2700 - 3200 rpm.
Mostly in 2nd and 3rd gear but can feel it in 4th and 5th as well at those RPM's.
It seems to be getting worse the more I drive it.

If I let off the gas it goes away.
If I push in the clutch, it goes away.
If I put it in neutral, it goes away.
If I am stopped in neutral, it doesn't shake at those RPM's

I think that tells me it's not in the drive line but more so in the engine, under load.

I've adjusted the IAC and timing a bit and saw no difference at all.
It almost feels like something is out of balance the way it shakes.

I'm going to look very carefully for any vacuum leaks tonight.
Any other ideas of things to look for?