Well my 1990 jeep idles high when the engine is warm in every gear except drive. It also has been dieing on me when I start it when the engine is warm and won't start back up again for about 10 minutes. I think its my IAC valve. Is there anything I should know before replacing it? Thanks

 

try cleaning it with carb cleaner before you throw money away clean the hole it mounts in real good also small tooth brush works good here also check for broken vacuum line while you under the hood