Let's start with the codes.
Po129 refers to barosensor
Po344 is a code for the camshaft position sensor
Po339 crankshaft position sensor
Po340 camshaft position circuit malfunction
Po335 crankshaft POS sensor malfunction
Po122 throttle pedal position
Item 2,3,4,5 relate to each other that s camshaft and crankshaft position sensors. Since both already show a malfunction code, it would be advisable to change.
Sometimes other codes show up because there is a relation but not that the item is bad.
SOURCE: 2005 dodge grand caravan stalling when you put it
1 Inspect Carburetor Dirty and Improperly Functioning Carburetor. 2 Inspect Carburetor Incorrect Carburetor Adjustment. 3 Inspect Carburetor Worn, Faulty or Damaged Carburetor 1 Inspect Carburetor Worn, Faulty or Damaged Carburetor. 2 Inspect Mass Air Flow Sensor Damaged, Loose, or Faulty Mass Air Flow Sensor or Circuit
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