[FocusGuy7476]

before you try gasket sealant, take your TB and the leftover gasket material that you have, hold it on to the TB and lightly hammer on the material that covers the TB and this will crease the edge of the material, do the same for the inner part of the TB. This should also make the gasket thinner.

also check to make sure you have the TPS sensor in the right position, you also may be able to adjust the the opening with a screw that on the TB.

I'm assuming that you have a Zetec engine.