Engine Vibration Issues

[97gst_spyder]

OK, so the car's history is unknown.

Things I've done to the engine:

Replaced drive belts
Seafoamed engine/oil/gas tank
Changed the oil 2x, engine has mobile 1 10w-30 with fram super $9 filter (only one they had)
Replaced the front motor mount, new mount and mmi.
New BISS o-ring
New air filter
Coolant flush and hoses

The issues:
The car has a uneven idle. I keeps an idle at 750rpms mostly, but the idle is like 'mmmmmmMMMmmmmmmmmmmmMMMmmMmmmMMmm' Thats the best way to put it.... Its not a huge surging effect, but enough to feel in the car.

The second one is when I go over 4k rpms in any gear. the engine gets a solid vibration to it. There are no cel's or anything. It happens in boost and no boost. I've noticed that the pulleys dont look completely straight (I don't think this engine is original to the car, there was a paper wasp nest in the crank pulley). But the crank pulley is in decent shape.

 

[LTUDSM]

here is some problems for engine vibration:

Lose Tranny bolts.
Lose flywheel
Broken Balance shaft belt
Separated Harmonic balancer

 

[97gst_spyder]

Also, forgot to add when in boost mostly closer to full. The car starts seems to hesitates once past 4k. Not as much now as it did before the new motor mount (old one was two pieces). I don't know if its related or not just throwing it out there. There major boost leak was fixed ( Biss O-ring), but I still have the 2g bov on there.