I am working on a 1989 Honda Civic DX with the 1.5 liter multiport injection, and after it is warmed up, it revs pretty high (2500 - 3000) when put in park or neutral, but it doesn't do it each time. I have gone through and checked out a lot of the vaccuum lines, and they seem alright. Anyone...
Check your fluid level. If it is low, be sure to only put in Honda fluid though because it is a different type than your average stuff.
Is your car idling weird? Sometimes in general when cars won't shift gears on their own but you can shift out normally, there is a vaccuum line leak that...