WTF my idle has mind of its own

[alp_2420]

so after runnin a few erands yesterday i got in my car and started it and right after the motor fired up the idle went to like 1500 then slowly climed up to 2-2500ish then i mashed the gas real quick and it droped off back to norm then i was going to shift into drive and it did it again mashed the gas and nothing it stayed and got a little higher so then i just put her in drive and it went away and drove fine and i checked it again at the house and it did it very little compared to befor and ive had no probs with that befor kindof weird

[alp_2420]

what no reply! awe come on people...

p.s. it did it again

[colinmi]

My idle did something like that two or three times in a couple months. It hasn't done it since I replaced most of the vacuum connections under the hood.

[shingleback]

Check the vacuum hoses to/from the idle control valve. They tend to harden and crack, and can cause problems like this.