Paying off a TL does not drop it from your avg age of accounts until 10 years after it is closed, so you wont lose credit history, so no FICO concern there.
A CFL is usually not secured, and is thus at a higher risk, and therefore not scored as high as a secured install loan, and presumably, from a non-FICO perspective, it is probably at a relatively high APR. Financially, it is probably not good to keep unless it is at a very low APR.
Paying if off will reduce your install % util, a postive. The only FICO hit you might take is if you have no other install loans, which might affect your credti mix, but that is minor. If you have other install loans, such as auto or mortgate, I would ditch it a NY City minute.