Have Toyota Questions? Ask a Mechanic for Answers ASAP
Hello and thank you for choosing just answer.
In order to better assist you, I'd like to ask you a few questions about your vehicle.
Is\was your check engine light on at any point?
Toyota does not specify specific values for a resistance check for the coils. The method we have used is to disconnect each coil while the car is running and find the coil that makes the least change in roughness and that's the bad coil.
Also cleaning the throttle body is a very common way to get rid of the rough idle, Use a good carb cleaner and clean the throttle body well, with the car off get all the piping to the throttle body and push the plate slowly and clean it with a rag soaked with carb cleaner and see if that improves your condition.