i have a 2005 mitsubishi galant . when idleing i stall out only when engine is warm and at idle

Question

i have codes p0171 , p0174, and p0431

Answer 1

P0171 Fuel trim lean Bank 1

P0174 Fuel trim lean Bank 2

P0431 Catalyst below threshold bank 2

Having a low fuel trim will result in a catalytic code condition , check for vacuum leaks , this engine  has a airflow meter (MAF) that measure air entering the engine any air that get past the MAF will result in a lean condition. Another cause can be fuel pressure being low.