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What was the outcome with this?

There are many reasons and theories as to why this happens, and there a better qualified people on this forum to give advice on the subject than me, but this is my experience.
I only drove my new...

... agree with Clunk and the other option is to use balance beads instead of fixed weights

Sounds like they haven't been balanced properly..... Or tyres and or rims are out of round.

To balance them properly they should be using fingers as per vid below

https://youtu.be/h0yWHKdMQR4

Im gonna go out on a limb and say I reckon the intercooler is leaking, being the original from 2004, unless its a fairly new OEM unit, it will be leaking. Also, I'd advise to run a needle valve with...

This pic shows the position of the Mass Air Flow sensor (on my ZD30) on the top of the air filter housing. Shown here with the wiring cover removed....