Just bought a 2002 Honda Accord Coupe LX and when i'm driving I noticed that the RPMs when im idle will drop suddenly and come back up to around 1000rpms seeming like it was about to die. Took it to AutoZone to also to see why the check engine light was triggered (See picture). What do you guys think the issue is?

 

Me, seems like two different issues.

Idle is one.

P1259 is another.

Is this a four or six cyl car?

For the 1259 code, start by being sure the oil level is full. clear the code and see if it comes back.

For the isle, can you give a few more details about what and when it happens.....only once the car is to normal op temp....all the time - cold or warm engine.

Without more info on the car.....I can't give much more. Want to help, just don't have enough to go on.