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i have a 07 mustang v6 on a hot day with the air running the car will die when coming toa stop taken it to the dealership and they cant find the probelm its done it every summer last year it didnt act up and now this year it acted up and dealership wont work on it cause warranty gone anyideas would help
 

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fuel atomization sucks during the summer and cars don't run near as good than if it was cold and having the a/c on puts just a little bit too much drag on the engine and causes it too die. when coming to a stop turn the a/c off and see if it still does it.
 

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You could check the TPS (throttle position sensor) and the IAC (idle air control valve) as both give feedback on the idle situation. Check for codes with a scanner as well.

You may be able to set the idle (so to speak) by disconnecting your battery and leaving it for a while (say 10 minutes or so). When you reconnect your battery, start the car and turn every accessory on (light, signals, max AC, radio, step on the brake, and turn your steering wheel. This gives the computer an idea of where it should set the idle to keep you running at a stop light.
Good luck.
 
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