idle issues
 

I have a problem with my idle when i start up my 86gt . It will fluctuate between 100 and 1100 rpms until shes really hot ( L on NORMAL ) ....
what could be the cause of this? Also when i put her into reverse from drive , the rpms will drop to 100 and then again fluctuate, also going from reverse to drive, its annoying and it sucks having to restart everytime i try to park..... any ideas on what could be causing and how to fix would be appreciated....


thanks