Car is not accelerating properly

2003 AUDI A3
171,000 MILES
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CONRADM
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my car stutters at about 3500-4000 rpm's.
it feels like it is struggling for power, replaced ignition coils (ouch) and spark plugs but still no luck, 2 'mechanics' could not find the fault and both had put it on diagnostic test, i feel it could be something on the ignition system but thats an uneducated guess, please please help!!!!
May 31, 2012 at 11:08 AM
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RASMATAZ
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Do you have a check engine light and when was last tune-up? Go to this walk thru link: https://www.2carpros.com/articles/engine-has-low-power-output
May 31, 2012 at 11:20 AM
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EXOVCDS
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2.0L FSi?

If yes, could be a broken diaphragm in the bypass valve.

Hole in orange diaphragm... see attached image.

Thomas
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May 31, 2012 at 2:17 PM
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