G'day all.
I am having a weird issue with my 2004 BA XR6T. Sometimes on start it will give a big rev to 2K and slowly wind back over 30 seconds or so to 1K. If I select a gear it runs like it's running on 4 or 5 cylinders with a check engine light.
Turning it off and starting it again fixes it to its normal average idle.
It only happens a few times a year and I can't reliably replicate it, just randomly happens some times.
So far I have cleaned TB, reset ECU and looked for vaccume leaks with no change.
Car is stock with 200K on it.
Anyone seen this before or have any ideas on it?