so my car has been running really rich lately and idles irradiclly. i'm thinking its my ISC. I just replaced the capacitors in the ecu becuase well they needed to be.. that didn't fix the problem. when i put the key in the "on" position (car not running) there is a clicking noise which sounds like its coming from the throttle body. it used to make the noise and then stop soon after.. now the noise doesn't stop. could it be a bad ISC or what? when i drive it sometimes it drives fine and sometimes it like stutters in first gear or if i give it alot of gas. and also when i cruise at a constant speed it will stutter once in a while. am i right about the ISC?