2004 kia rio has rough idle when cold. After engine reachs normal operting, engine stalls out and will not hold an idle. rating

SOURCE: ENGINE WONT TURN OVER

sounds like the timing belt it has a interference engine so if the timing belt broke you could have bent rods and cracked pistons or worse. good luck

SOURCE: kia rio 2002 camshaft pos. sensor just replace still light check

check the belt,if its out it will flag up this code,your car will run on sequential firing from the crankshaft sensor,failing that put an oscilloscope on the signal wire at the sensor and ecu its possible the ecu might not be seeing the signal,start with the basics first

SOURCE: engine stall

Fuel fiter or spark plugs?

SOURCE: 2001 kia rio engine looses power

try your crank shaft sensor, sounds like the same problem i had , had crank shaft sensor replaced and it drove fine afterwards. maybe go to auto zone or something and see if that code comes up

SOURCE: My 2001 Kia Rio idles

It may me the Transmission Modulator Value.
a small diaphram value that measures pressure and tells the transmission when to change gears. If the diaphram is leaking it never can measure the right pressure. its on the transmission housing. Just disconnect and screw it out.