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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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