91 Firebird wont idle at all after sitting 2 weeks

Hi All,
I have a 1991 3.1L V6 Firebird (automatic, and A/C incase it matters) w/160k miles that was running just fine a few weeks ago, but I let it sit for 2
weeks (just felt like driving the Fiero and the motorcycle instead...;-), and now it won't idle at all. In order for me to be able to get it to start, I have to hold the gas pedal down. As soon as I let up, it stalls. If I rev the engine, it back fires a little.
I've changed the plugs, wires, cap, rotor, and even changed the EGR valve, since the ECM had been showing a code 32.(though really, that 32 has been in there for about the last three years, doh!).
And within the last year, I have change the fuel and air filters.
Anyone have any guesses/advice?
Thanks in advance.
---Robert 91 Black T-Top Firebird 86 Gold Fiero 2m4 86 Red/White/Blue Yamaha FZ600
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Unbolt the negative battery terminal, wait 30 seconds, then hook it back up. (to reset trouble codes) Then, start the car up again and wait for the SES light to come on. Just to make sure that there are not any more trouble codes. Also, check your fuel pressure.

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Doh!, pulled the negative battery lead for a while, reconnected, and it started with no help from the gas pedal! BUT...... After it got warm, it went back a symptom I had last year for a while, that went away on its own last time after a few weeks: stalls when you try to stop the car. Runs perfectly normal when your on the move at 55 (no skips, etc), but stalls, or at a minim wants to stall (doesn't always, but does 50% of the time other 50% does stall), when you hit the brakes.... Any ideas? Was thinking vacuum leak, but can't find one anywhere.... No codes in the ECM right now...
Thanks.
---Robert

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It sounds like you have a vacuum leak. I would say check your EGR but you said you already changed it. And also...the reason why the engine runs fine until it warms up is because when the engine is warming up, then it is in open loop mode. And while its in this mode then its running rich. And the rich mixture is more tolerant to vacuum leaks. One more thing to check might be the Idle Air Control valve. Its the valve that controls how much air is let in while your stopped or parked.

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