well i swapped throttle bodies today. and it still does the same thing. but now i noticed at slight throttle you can hear the air rushing in the air flow meter then when you release the throttle you here a a sucking sound like vacuum then the idle goes down. i also have to push the butterfly a tiny bit more and the the idle goes down further. ive adjusted the dashpot and its not sticking. anyone know what would cause this. i looked at the plugs and the ground is white but the electrode it brownish white with no wear on it.

91 pickup 5.29's US GEAR.35x 12.50 trxus m/t.5 speed swap- SOLD!
96 4Runna limited-toytec/OME lift,diff drop Nitto 285/75/16 Elocked=butter
07 FJ cruiser 3" DR coilovers 285/75/16 nitto TG. allpro sliders