Code p 0457 refers to the EVAP system--leak detected
code p 0340 refers to cam shaft position sensor A bank 1--circuit malfunction == causes --wiring ---CMP sensor ---ECM
at this point I would be checking the Cam shaft position sensor and wiring as it could be failing at rpm's and causing the problem
let me check codes ill tell you this evening after work ok
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I have the same problem with my 2005 Dodge Stratus 16 valve I'm going to check my O2 sensor in my map sensor first then I'll let you know how it goes
Crank shaft sensor
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