Won't transition to idle once engine's warm (1 Viewer)

[60tex]

Guys - I'm a little stumped.

My 60 cruises well, and idles well. But once it's fully warmed up and then some (probably 20-25 minutes+), it won't transition from cruising (let's say 2000-3000rpm or so) to idling without dying unless I blip/stab the gas during that transition. If I don't blip it for about 1-3 seconds to "catch" it as it hits around 1200-1500 rpm, the rpm will just keep dropping from cruising rpms down to 0. With the stab, it'll usually settle into a nice idle. I've gotten a little used to it, but it takes some fancy footwork when I'm in traffic.

Thanks!

 

[morganism]

Thats usually a vac leak. Are the hoses to carb on correct ports? i like to use color coded silicone vac lines. Does turning on AC make engine speed rise?

 

[mwebfj60]

Are you smog legal? Desmogged? Is the decel circuit intact or do you have it grounded open? Sounds like the decel idle cut solenoid (ICS) may be sticking closed or emissions computer is keeping it closed so when you "stab" the throttle your accelerator pump is shooting a little fuel into the throttle body to compensate for the idle circuit being shut off and/or releasing the high vacuum signal to the decel circuit . I would start by checking the idle cut solenoid and decel vacuum switch per the FSM and check the connectors at the distributor and coil/igniter for corrosion and such.