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i have replaced the camshaft sensor, both o2 sensors, and the coolant temp senso on 2003 Mazda Mazda6

and the codes po340 and po128 keep returning. the engine surges a little and at hwy miles mph 65 to 70 the rpms go crazy but nothing major drivibility wise. can someone please help???

Asked by for the 2003 Mazda Mazda6
seek diag you may have a circuit issue