I am having a problem with my 2005 Avalon. About 2 weeks ago the check engine light came on and the engine started to misfire. I put some fuel treatment in the tank, I thought maybe it was a problem with some bad gas or water in the tank. I had the check engine codes checked they were P0302, P0303, P0304, P0305, P0306, P0355. The car has about 99K miles on it.
Check Engine Light On - Engine Misfire on 2005 Toyota Avalon
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P0300 is engine misfire, the other codes identify misfires in cylinder 2,3,4,5, and 6. Check for a big vacuum leak at the intake manifold (hose of intake boot ripped. A bad air flow meter could also cause multiply cylinder misfire on the Avalon.