Hey all, Firstly some history. Car is a BA XR6 Turbo auto running 369rwkw with 150,000km on the clock. It's had a post 06/06 short motor for about the last 80,000km but the head is original. The car has had a miss and rough idle for years. There is no miss under load. It runs fine in gear and under acceleration. Over the last couple of weeks the rough idle resonates and vibrates through the car. Steering column, mirrors, seats etc. It wants to stall too. It evens out after 10 minutes of driving or so but is still there. After disconnecting battery, the roughness is a lot better and doesn't want to stall as much but it's still a little rough. A couple of nights ago it developed a ticking noise which seems to be coming from down low. It's a lot louder under the car. Not that noticeable from engine bay.
Car still goes fine under throttle - no miss or reluctance to rev. Still making same boost. No fault codes. Flex plate? Rod? Lifter? Timing chain tensioner? Opinons? Cheers, Steph. .