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Coolant temp sensor.
CRAIG
Reason:
If your coolant temp sensor is faulty your cars ECU will thing the air is something like 600degrees F, so the fuel map for starting will be all messed up. Not sure why it would act like that when its still warm out. Usually it only happens when it gets down below 20 or 30 degrees. But I would check there first, then check your MAF for problems also.
Oh yeah, does it throw a CEL at all? A good sign of a sensor is when the car will run like crap and be acting up and then it will throw CEL then start running half way decent. Thats the car bypassing the sensor.
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