I have already replaced the Idle air control Valve and the fast Idle Thermal valve, Neither helped at all,I also checked for low coolant and vacume leaks. It is a 93 dx so I dont have a tach but I would say it bounces from 1000-2500 rpm's while at idle. Any help would be great

 

try bleeding the coolant system. theres a bleeder on the upper neck. there is also a line that is in between the head and intake plenum that needs to be bled. thats what is probaly causing your idle issue. Ill try to find a pic ,or maybe someone else can post it if they have it, or try searching for it

 

Possibly a vaccuum leak around your intake mani fold gasket?? spray some ether (starting fluid) around the gasket and see if your engine revvs change at all.

 

yeah if you replaced both and checked coolant look for vacuum leaks