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Intermittent high idle on start with rough idle

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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?

Edited by Flav
I cant spell good.
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It's probably going to be close to impossible to diagnose an intermittent issue that only happens only a few times a year and you have no way of confirming if you've actually fixed it other than the be surprised into the negative result...



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