So I have a 95 Civic coupe with a d16z6, I've been having this problem for some time now. It starts good and seems to run great until I want to stay at one speed... If I try to hold my speed, the rpms start going all over the place like I'm slamming on the accelerator and then slamming on the brake over and over again. It accelerates and decelerates just fine, it's just when I want to stay at one speed. Thank you for any help

 

what engine codes are being thrown?