Difficult Cold Start
WARNING: This page is about a different car, the 1987 Acura Legend and 1986 Acura Legend. However, it is still accessible from the selected car via links, so may be relevant.
Check if PGM-FI light and Red LED light is on. This indicates that back-up system is in operation. Replace ECU with one known to be good and recheck. Check coolant temperature sensor, electronic idle control valve and all other idle controls.