i have a 2004.5 i got with 150,000 miles. when i first got it, i noticed it would idle roughly and if i turned my a/c on it would go away. now it gets bad and the throttle will get stuck about 2,000 rpms in drive or nuetral and ill have to stop it by braking or cutting it off. its also blowing white smoke.. i had a quadzilla xzillaraider on pl 5, k&n intake, and 4 inch straight pipe exhaust. It hasnt had a valve adjustment or injector replacement to my knowledge.. i got it off iaai.com any help would greatly be appreciated.