Hi guys,
Been having some problems with my au xr8 recently. Getting worse and worse.
Mainly when it's cold but first morning start up taking off normally it starts to miss, cough and running really rough and seems like a pulley belt screech. Then when it warms up it doesn't seem as back but still misses breifly. I put new plugs, and has new performance ignition system. It's been tested and they can't fault the ignition and diagnostics can't pick anything up.... Car is manual if they makes a difference....
Maybe crank angle sensor? Crook injector?? Any helps appreciated

Thanks

Harmonic balancer or cam syncroniser.

Maybe the balancer but the cam is chain driver. That can't change..... I think it may be electrical or fuel related. Is it common for crank sensors to go? Car has done nearly 200,000k's