I registered to this forum just because i have same problem and haven't found answer to it..
I have changed camshaft sensors, coils, sparks, fuel filter,CCV, MAF and solenoid valve o-rings.
Nothing seems to work. Please reply if you have solved this.
(Edit: Actually i almost celebrated when i changed solenoid valve rings, car started fine and i were happy, but then it started to make terrible noise and i noticed i hadn't pushed valves all the way in. When i pushed them noise was gone but problem was back. (Sorry about my english.))
Last edited by JakuLuka; 01-07-2013 at 02:10 PM.