Definitely check the switch to be sure it is functioning as Stuart says. If
not replace and readjust. Also, pulling the entire intake system and
cleaning and replacing gaskets helped my off idle bog. From the Air Filter
down to the intake runners, pull it, clean it, replace gaskets. Clean and
paint your plenum while you are at it for a nice clean finish. Also check
that all of your vacuum lines are connected and secure...fiddling around
back there can knock some stuff loose or just enough to create vacuum
leak...

good luck
Ryan

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