I'm getting a code p1450 & p0340 on 2004 freestar 4.2

Question

plus when i fill with gas it wants to spit the gas back out. Are the problems related and what do i do to fix. thank you

Answer 1

P1450 Excessive vacuum detected in the fuelk tank

P0340 Camshaft position sensor circuit malfunction

The camshaft position sensor  is used to synchronize the fuel injector, when this sensor is failing you will have intermittent stalling, They do have high failure rate,Becuase of P1450 if you are experiencing excessive cranking this may be related to P1450 which is caused by a kink or bend in the fuel vapor lines,if the fuel vapor lines are clear you have a canister vent solenoid blockage,if the lines are clear replave the canister vent solenoid