I have on my 2010 corolla with idle problems. I use only high octane fuel because of engine bolt ons. When the car is on idle when at a stop light it seems to vibrate hard and engine sounds like it is going to die. A very slow bush cutter like sound. The car has died on its own a few times. I would give it to the dealership but I have a unichip on the ecu and check engine lights that always pop on. I changed the oil and the sparkplugs but I am not too sure if the spark burnt out from running it too hard.has anyone had this issue? Or have an educated guess to what it might be?