da_warped_1
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Hate to say this but it could be the timing chain start up rattle as per description provided above
How many Ks on the engine? 100+
Also let me know the sound of your engine while idling at maximum operation temperature?? So after a drive while idling Is it grumbly or nice smooth and persistent.
If it's a misfire type of issue, I'd start by replacing the fuel filter as this could be a cause, and fill up the tank with BP ultimate 98 octane and see how u go if it still exists then check spark plugs and replace.
Maybe try get the sound on vid as that will help us try help you.
Dave.
Its only got 90,000 Km on the clock. At max temp the idling is smooth and i have not noticed this problem affect any other operation of the car. If it happens again ill try and get a video going. I run on 95 octane all the time, might look at changing the spark plugs.
I recently changed the paper manifold gasket to the metal/rubber or silicone gasket, is it reusable or will have have to buy a new one when taking the manifold off to access spark plugs.