When my engine idles its goes from about 950- 1500 RPM continuously, I already changed my PCV valve, so thats not the problem, can it be my EGR, or something even worse. I am going to clean my intake filter today, but I doubt this is a problem. Any one have this problem or had this problembefore? PLEASE HELP

 

what engine?
does it when hot and cold?
do a search for iacv

 

IACV, FITV or maybe a vacuum leak somewhere.

 

engine is a d16z6 , check the IACV for dirt, or electonicly test it?