It was very slight pressure, it felt like a very, very weak human pulse. I would rather see a tiny bit of pressure, than un-filtered air being sucked in. The car runs great, nice even idle and smooth power up to 6K rpm. It seemed to miss, slightly with the tape on it.

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1993 190E 2.6 135k
1989 Ford Thunderbird SC 5 Spd 79K