Interesting. I recall on the past testing via the intake tube. This time seemed different with the buildup of pressure. Maybe something going on with my throttle plate. It's on my list to take off and clean. Ingot a new gasket for it too. Thanks.

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2003 X5 3.0i Silver (build 07/03)
2006 X5 3.0i Blue
1977 Ferrari 308 GTB
1994 Ferrari 348TS Speciale #14/15
1989 Ferrari Testarossa