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My car has this problem where it would stall at startup. It only happens every so often and it doesn't always fully stall but it would come close each time.

When I turn over the engine it would sound like everything is going fine and the motor is going to start so I let go of the key. Then disaster strikes. You can see the RPM couldn't keep up and the car would start to stall. Sometimes I get lucky and the car would slowly rev back up in the next .5 - 1 sec. But if it doesn't I am screwed because I won't be able to get the car started again after it stalled. I have to wait 24hrs before it would start again. It seems like it gets flooded with gas and it needs time to evaporate the excess gas.

I had it towed into the dealership before and of course they were no help and said the problem can't be reproduced.

So where do I begin troubleshooting the problem on my own?
 

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For me, I get the car started, but sometimes the idle is at 500 rpm RIGHT after a cold start, then if I give gas, the car either stalls or gets really boggy and rough.

Here's a list of what Mazda says are reasons for the car to stall after startup:

• A/C system operation is improper
• Air leakage from intake-air system parts
• Purge valve malfunction
• Improper operation of IAC valve
• EGR valve malfunction
• No signal from CKP sensor due to sensor, related wire or wrong installation
• Vacuum leakage
• Engine overheating
• Low engine compression
• Erratic signal to ignition coil
• Poor fuel quality
• PCV valve malfunction
• Air cleaner restriction
• Restriction in exhaust system
• Electrical connector disconnection
• Open or short circuit in fuel pump body and related wiring harness
• No battery power supply to PCM or poor GND
• Inadequate fuel pressure
• Fuel pump body mechanical malfunction
• Fuel leakage from fuel injector
• Fuel injector clogging
• Ignition coil malfunction
• Improper air/fuel mixture ratio control
• Improper valve timing
• Immobilizer system and/or circuit malfunction (if equipped)
• Immobilizer system operating properly. (Ignition key is not registered.)
• Pressure regulator malfunction
 
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