Accord 87 carb with high idle speed

Accord 87 carburetor / auto transaxle / too many miles
Came one month ago from Europe, bought this car. At cold start it goes to 1800 rpm, and then the idle speed goes wrong at 2000 rpm and more. Even after 10 min it stays at 2500rmp. Don't like to put it in Drive at these rpm, so I have to fix it, but I am not sure what's wrong. Something with the carb, or the cooling sensors... Daoes this model has a ECU, and if it has where should I read the blinking error codes ? Need some help guys
Thanks.