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When i first start my 91 accord(wagon :clap ) it idles just fine. After i've driven it maybe 10 miles, and put it in park the rpms will go up to 2000 then down to 1000 then up to 2000, over and over, if i put it in gear or neutral it will stop doing it. Anyone know why?

the car has 200700miles on it. automatic, just changed the oil and air filter. plugs, cap and rotor arm changed not too long ago.
 

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it is the good old honda virus lol , it could be your iac idle air control valve or your throttle body could need to be cleand also could be map sensor..
 

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i dont know if it will help but try resetting your ECU
 

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The fast idle control vavle could have wiggled loose it happened to me about a month ago i just took the throttle body apart and screwed it back down and the problem was gone.
 
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