hello

when i hit the brakes hard the idle drops
from 750 to 350 rpm then takes about 15
seconds to get normal at 750 rpm. 350 sb
edelbrock performer manifold with 600 cfm
edelbrock performer carb and a mild crane cam.
any ideas what the problem is? other than this
the engine runs perfect,i am just breaking it in
it has 400 miles on it.

thanks for the info