Check out the bolt holes on the intake manifold gasket
http://www.autozone.com/autozone/parts/Felpro-Intake-Manifold-Gasket/1986-Honda-Civic//N-ij8amZaliz2?itemIdentifier=72993_0_0
have you removed all the bolts?
NOTE… You mentioned throttle body so I assumed you had the fuel injected engine.