2003 Mazda Mazda6 Q&A

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

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??? -
Answer 1
seek diag you may have a circuit issue -