iv got a 92 ex and when I start the car it idles at 2000rpm and after a few minutes it drops to 1000rpm and then back to 2000. this only happens when the car is in park and nuetral. no vaccume leaks at all. what else is there I can do to.fix.this?

 

https://honda-tech.com/forums/honda-accord-1990-2002-2/1990-2002-accord-faq-1664547/

start here and see if this fixes the problem

https://honda-tech.com/forums/tech-misc-15/surging-idle-how-tech-article-56k-beware-1003988/

https://honda-tech.com/zerothread/1844067

 

I adjusted the iac valve and now she ours like a kitty. thanks for the help much appreciated!