wont idle in gear

hey guys. ive got a few threads going on my tuning adventure. but right now im having trouble with just getting it to idle in gear. today i got it to idle fine when i would pull up to a light. then i jumped on the freeway and when i got off it was stumbling and wanting to die. i tried checking for vacuum leaks with carb cleaner but can get any results. i sprayed it all alound the base of the carb to see if i had a leak there, i also sprayed around the plugs in the intake and nothing. lastly i sprayed where the intake meets the head and nothing. i noticed sometime when i come to a stop the idle stays a little high for a second. and if i tap the gas pedal i can usually get it to go down.