I have an '86 Prelude with a 1.8 liter dual carb engine. When I press the
brake pedal hard the engine RPM drops a bit then stabalizes. When releasing
the brake pedal after pressing it hard/far the RPM drops to about 100-200
and the engine almost stalls. Is this normal? I know the engine is tiny, but
I would thnk Honda wouldn't make a brake booster so big that when vacuum is
applied it leans out the mixture to the point that the engine almsot stalls.
Perhaps there is a vacuum leak somewhere in the booster or lines connecting
to it? Any thoughts/ideas? Thanks.

Cory