idle is low and dies at stop light.warmed up for 10 minutes runs okay.new iac,fu

Possible coolant temp. sensor, coked throttle body or thermostat problem.

my friend we need to get a reading of the coolant temp sensor wheen the car is cold. when a engine is cold is must use more fuel to get warmed up and then when the engine is warm it needs less fuel fuel so what im thinging here is that when the engine is cold the temp sensor is tell the pcm the engine is warm so the pcm is sending less fuel then it needs. the coolant temp. reading on a cold engine should be outside temp or colder.

do fuel pressure test. one when cold. one when hot. possible issue fuel delivery(fuel pump).