cold starting problems

My 1988 s10 blazer stalls out when I do a cold start only, 2.8 liter v6, It has 170000 kls on it and I have done a tuneup, pluges cap rotor wires. The old plugs looked good when I pulled them out, and I do not think it is a spark problem, did a fuel filter change too. It starts and runs fine when it warms up.

might be the engine coolant temperature sensor if you have a decent scan tool you'll be able to see the temperature the computer sees.