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99 Lexus Es300 Misfire

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I have a 99 Lexus es300. Car was running fine. Suddenly, CEL appears. Very rough idle, smell of exhaust when it is idling rough, hesitation, and at random speeds engine cuts out like you turned it off and then speeds up again. Codes are P1354, and random misfire codes for 2, 4, and 6. Car seems to run fairly normal until engine warms up. already replace 2 knock sensors and front wheel speed sensor. Any help would be greatly appreciated.

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