I'm following this thread with interest because I have a strange condition haunting my 300e. I have a starting/ stalling/ eratic idle/ check engine light/ overheating OVP and overheating power window relay problem. I've replaced the OVP, fuel pump relay, injector temp sensor and even the CIS-e unit!(talk about hanging on to your wallet!) When it chokes down I hear the idle valve clicking every few seconds sometimes and sometimes not. Is it supposed to click with the ignition on but the engine not running?