Car starts and then dies...

[miksax]

ugh...
I'll try to keep this explanation short...
Now that it's becoming colder out, when I start my car (cold) it'll start up fine and then die in about 3 seconds.
There is also a weird hissing sound coming from the passenger side near the firewall whenever I accelerate and the car is cold. This sound is gone in a couple blocks of driving.
I think my heater core is dead (or on the way out)...are these symptoms at all connected? I also pulled codes that stated the car was running lean. Before I spent 45 bucks on the fuel pressure and vaccuum gauges, I wanted to see what you guys suggested.
Thanks for any help

 

[jrichker]

See "Surging Idle Checklist for help with all your idle/stall problems. The first two posts contain all the updates to the fixes. I continue to update it as more people post fixes or ask questions.

 

[PJB]

I guess Ill have to test/replace my IAC because mine stalls when first started or put in gear too.
I just thought it was because my car is a POS.