So to close out this thread I have worked out the issue, after changing out the harmonic balancer I was still struggling to work this issue out.
It turned out to be an issue with the torque converter. Replaced the torque converter and it was fixed.
There were some bolts missing from the bell...
Hey all, currently trying to find a fault where engine runs a bit rough between 1500-2000 RPM, mostly under load, when I back off, or when travelling at a speed where the engine speed is between those ranges. It is also worse in 4x4 low, and in reverse, where it shudders the car.
It has got...