yea i have a stock 97 civic dx, and when im idling the rpms bounces to like 1500 and comes back down, and when i give it some gas it stops and when i turn on the a/c it also stops bouncing.

anyone know whats wrong?

 

it might be your fuel pump...you'll need a new one...my cousins gsr did that and it was his fuel pump...when A/C is on its stops too...somebody correct me if im wrong...

 

I vote Idle Air Control Valve.

Do a search, you are not alone...

 

bump?

anyone know for sure?

 

to the top...

 

I'm with Gary. Clean your IACV with some carb cleaner, put it back on, and see if that fixes the problem.