Civic Sedan L4-1493cc 1.5L SOHC (D15B2) TBI (1989)
Throttle Cable/Linkage: Technical Service Bulletins
Engine - Idle Fluctuation Service Tip
Civic Idle Fluctuation
If you're working on an '88-91 Civic with idle fluctuation (particularly a dual-point injection model), check the throttle cable free play. The EACV has
trouble controlling the idle properly if the cable is adjusted too tight.