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1994 Toyota Camry V6
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Hi everyone,

the car is a 2008 Toyota Yaris with 155k miles.

The car is throwing misfire codes P0300/P0301/P0303/P0304. It has a rough idle. The spark plugs and coils were recently changed, so I'm wondering, what could be causing this issue? Maybe EGR valve? But wouldn't that cause other EGR related codes?
 

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Hi I've had same problem Toyota do not like aftermarket products. changed my plugs with those from autozone and kept misfiring come to find out these stores no longer carry the exact OEM product that goes on the car. They are all after market. So I went to Toyota got plugs and no more misfire. I know sometimes autozone is cheaper than the actual Toyota car place but the computer doesn't like it and will give problems with some aftermarket products.
 
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