was running the p13 ecu with my d16z6 only problem was it was trying find an idle so i bought the correct ecu the p28 and after i plugged it in it runs fine.. until i let out of the gas and push the clutch in the idle goes down really low and sometimes stalls out...any suggestions?

thanks

 

adjust the idle screw on the TB, check for CEL's, throttle cable could be loose as well.

 

before adjusting the idle bleed screw... unplug iac, jump the 2-pin connector by the ecu (stops ecu from correcting the idle) THEN adjust the screw. When ur done, reconnect the iac, reset the ecu n ur good to go.