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1997 Toyota Avalon Question: Avalon Misfiring! Codes P0300,P0302,P0304,P0306!

 

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97avalonxltrouble, 3.0L V6, Westlake, OH, March 03, 2013, 12:18
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Recently did a timing belt on this car. Ran Perfect. I was on the highway and then the engine light started blinking and throwing codes P0300,P0302,P0304,P0306. I changed the plugs, wires, tested coils seemed okay. changed the front 3 injectors. I have a new fuel filter for it still havent put it on. Tested crank sensor and it came out good. I dont know what else there is. Maybe a clogged Cat? but wouldnt a clogged cat cause misfiring on all cylinders? Please help thanks

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