Have Toyota Questions? Ask a Mechanic for Answers ASAP
Thank you for allowing me to help you with this concern today and am sorry to hear that this is happening. I will have to ask you a few questions so that I can get a better understanding as to what may be going on with your Avalon.
It sounds like you know what you are doing here so lets cover a few things..
What brand coils and plugs did you install? (OEM Toyota brand)?
Did you replace all the plugs and coils?