After taking my Z to the local drag strip I noticed a strange misfire at idle which after checking everything out led me to low compression in the #6 cylinder with 90psi. Every other cylinder has 150psi. The engine was rebuilt 10,000kms ago.
There is also this weird rattling noise only at first throttle but sounds higher up in the engine. I've been told it might be a stuck lifter or a broken valve spring. I'm hoping this is causing the low compression.
