high idle

[bobs 93 x]

just a few days ago, my 93 started to idle higher than normal. lets say i'm coming to a stop sign, the rpm's will stay at about 1500 for a few seconds then slowly drop down to a normal 700-800. if i pull into my driveway and stop, the same thing happens. if i wait for it to drop then shift to park, the rpm's will jump up to 1500 and then slowly drop to normal. what should i look at to correct this?

 

[88vert]

Sounds like your IAC vavle needs cleaned

 

[FordExplorer18]

IAC needs to be cleaned or you have a vac leak somewhere. I would check all of your hoses.