The problem is, you said you are fermenting a pilsner as an ale. I'm assuming you are fermenting near room temp around 70? You're using a lager yeast, which most likely only works at temps much lower than 70. Re-pitch any type of ale yeast.
Drinking - Green Tea Ale, Zythos Ale, BM' Red Hook ESB Clone, SMaSH GP and Cascade IPA, Jalapeno IPA, Black Eye Rye, Yoopers House Pale, Washington's Small Beer
Aging - Oaked Vanilla Java Porter, The Great Pumpkin Ale, Mosaic IPA
Fermenting - American Barleywine (Don't Open 'Til Doomsday), Clementine Wheat