Won't Idle cold

[Beater_1500]

ok the truck is an 89 c1500 w/5.7 and it will not idle on cold starts. It takes longer than normal to crank the engine then it fires and if I don't hit the gas pedal and keep it rev a tad it just stalls. Now once it warms up it runs fine and starts back up fine. Thanks in advance for any help or advice.

 

[barebones 1500]

sound like a throttle positioning sensor or something like that. throwing any codes?

 

[LikeARock]

coolant temp sensor would be something to check... there are 2, one for the computer and one for the dash gauge/light... so even if the gauge reads accurate it does not mean the computer is getting a good reading

 

[FastOrange]

coolant temp sensor would be something to check... there are 2, one for the computer and one for the dash gauge/light... so even if the gauge reads accurate it does not mean the computer is getting a good reading

Word, One beside thermostat is for Computer.

 

[Beater_1500]

Yes there is a code sorry I forgot to mention that. Code 15 coolant temp -38 more than 3 seconds. Where are both of the coolant temp sensors? I know the one on the front of the driver's side head, where is the other?

 

[FastOrange]

Yes there is a code sorry I forgot to mention that. Code 15 coolant temp -38 more than 3 seconds. Where are both of the coolant temp sensors? I know the one on the front of the driver's side head, where is the other?

other is beside the thermostat housing

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[Cooter]

I'm reviving this rather than making a new thread. My truck does the cold idle lope too, once its warmed up it is normal. I don't have no CEL's either, and I know the check engine light works. EGR is replaced btw, and IACV was pulled and cleaned out with brake clean. Should I try this coolant temp switch?