alright i got a cel code 13 atmospheric pressure code on my 91 DA the car idles from 2200 to 900 rapidly at first i had already replaced the iacv and the fitv i checked for vacuum leaks no to the slightest degree hooked up a vacuum gauge to it nothing. now the i had done a 5spd conversion bout 6 months ago but the problem has been since i bought the car a year ago the car sat for about 6 months prior. need help with this problem the erratic idle is driving me mad

 

could be the TPS, on my DA6 and a mate prelude when they were converted to manual the tps needed to be set. Think auto runs with a slightly higher closed voltate for the tq converter.