Has anybody had an issue with the idle valve before? what happen is my car starts up just fine, but the RPM will drop all the way down to 0 and stalls the engine. And my mechanic told me that the problem is with the idle valve/ or throttle body needs to be clean, so i went ahead and opt to clean it cause it was cheaper and now two months later the problem has came back, and he told me he will need to replace the throttle body on the card in order to fix this, and its going to cost me about $4-500 this time... has anybody had this issue before? Please shed some light. Thanks!!