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Thanks to both of you for the replies. I forgot to mention, I unplugged the AMM and it DID idle better. So I got a spare AMM from my 92 940 and swapped it in...same damn thing. Identical. I thought if you unplugged the AMM and the idle reverted to normal(limp home mode) it was dead nuts diagnosis for a bad AMM...apparently not. Also saw this post and it too seems to indicate that normally there would be an accompanying code for the 02 sensor?
http://www.brickboard.com/RWD/volvo/1333103/220/240/260/280/24091_check_enging_light_code_113_car_running_well.html
Hmmmmmm
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