So this is my first post on here and I don't like the fact that it's one asking for help but I have tried everything I can think of at this point.
So the car idles perfect for the most part, however, at highway speeds, the car likes to buck randomly and it seems to only happen if the car is at operating temp and it is held at the same rpm for more than a few seconds between 2k and 3.5k rpm and I feel like I have replaced everything that could be causing the issue, however I am not a mechanic and don't know anyone that knows anything about cars to ask and can't afford to take it to a mechanic at this point

Car: 2001 Monte Carlo LS 3.4 207k miles

Video: https://www.youtube.com/watch?v=5wff...ature=youtu.be


Things I have tried
- Replaced Plugs with OEM ACDelcos.
- Replaced Wires with OEM ACDelcos.
- Replaced EGR valve
- Replaced Balancer
- Replaced Rear crank sensor behind back exhaust manifold
- Replaced the crank sensor behind the Balancer
- Replaced crank sensor under power steering pump
- Compression tested Excelente considering 207k miles
- Replaced alternator
- Replaced all three coil packs with OEM

(PS. The whining is from a bad AC clutch bearing)