Originally Posted by FBinNY

This doesn't add up. I don't know of any carbon quill stems, nor do I know of any CF forks (with CF steerer) that will accept a quill stem.

Since you have a quill stem, then I assume you have a 1" steel fork steerer (regardless of whether it has CF blades). If that's the case search threads for removing a frozen aluminum stem from a steel fork. If not, please restate the problem making clear what parts are stuck and what they're made of.

FYI- the steerer is the tube attached to the fork crown and which runs within the head tube of the frame to the top where the stem is either inserted (quill type) or clamped (threadless HS type).