I have a 1983 380 (upgraded to a 560 outside) that idles at 3000 rpms. I have replaced the idle control valve and the idle control unit and it still idles at 3000 rpms in adition it now has started dieing at stop lights after it lurches and acts as if it is gas starved. Where should I look next sensors? feul filter? vacuum lines? Is stevebfl out there?