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  1. Repair & Maintenance
    I have a 2002 Celica GT, recently it began idling rough had laggy throttle response and was misfiring. I scanned the CEL and got these codes; p0300 p0303 p0302 p0304 p0171 p0420. First thing I did was replace the o2 senors. This made the car run even worse. I checked my coils and spark plugs...
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