Hi, so i have search but majority of the idle problems are on mpfi. so my symtom is that it idles fine until its warmed up. then it would be at 8/900 jumping to 1.5 k and dropping back to 8/900 rpm. my friend told me that it was the pcv hose since it had a tiny rip in it. so i replaced it with a new one, but problem is still occuring. if anyone experience this and found a solution please let me know. i am willing to listen any educated suggestions. again my car is a DPFI.