Could also be the idle control valve sticking, you can disconnect the valve, unplug the air hoses and unbolt it, then spray it liberally with solvent. If you have a 9v battery, you can connect the poles to the leads on the valve to energize it and help expose more of the valve surface. Do this outside and be careful about sparks - don't want to set yourself on fire!!

Can also try cleaning out the mass air meter - if you remove the air filter housing and depress the meter plate, spray a bunch of air intake cleaner up towards the meter plate hinge. You'll need a spray can with a plastic extension to get up there. Have some paper towels to soak up the draining solvent from the bottom of the housing.

Anthony