Idle problems on 1997 Toyota T100

In the morning when I first start my truck it idles high until it warms up As it warms up the idle slowly go's down to a perfect 850rpm Once I start driving and have come to a stop the idle shoots up to 1800 then I have to stomp or tap on the pedal to bring the rpm down from that point the rpm won't go back to 850 the best I can get it at is 1100rpm Funny thing is I had no problems until I cleaned the throttle body I wish I would've left it black and dirty at least it idled somewhat better

by in Potwin, KS on May 20, 2014
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1 answer 6 comments
ANSWER by , May 21, 2014
Did you changed the throttle body gasket? Check your throttle cables first possible binding....
COMMENT by , May 21, 2014
No I didn't change the gasket because it looks good. As far as the cable go's there are no noticeable problems throttle cable is loose when disengaged. Like I said, it was idling fine until I cleaned the throttle body about 2 years ago and after 2 years I'm about to loose my mind
COMMENT by , May 22, 2014
Check engine light is on?
COMMENT by , May 23, 2014
check engine light isn't on
COMMENT by , May 23, 2014
Possible symptoms Vacuum leak inspect the hoses Idle air control valve- the valve is corroded it could be stuck Intake manifold gasket leak or throttle body gasket leak
COMMENT by , May 26, 2014
I took your advice and changed the throttle body gasket Now for reasons I can't explain; When I first start it in the morning the idle starts out at 850rpm and steadily moves up to 1800rpm's that's totally backwards from last week But the driving part hasn't changed. The idle still shoots up to 1800 when coming to a stop Today I'm going to pull the cable out and check it but I think I'll just be wasting time. You know I did buy a idle air control valve from a auto wrecker installed it but no change is it possible that one could be bad also. And what are the possibility's of it being the mass airflow sensor sending bad info to the throttle body?
COMMENT by , May 26, 2014
Try unplug the maf sensor And start the vehicle see if it makes difference.