wierd problem with the car...

2002 BUICK REGAL
118,000 MILES
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D_PASOVIC1995
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The car starts and while its stationary it runs for a very long time but as soon as i put it in drive i can only go for abot 150 yards until it stalls then i turn on my hazards and it will drive until the motor gets heated up and it will turn off again and i wont be able to turn it on until it cools down... the fuel speculations are correct, batteries good, starter is good, fuses and relays are all working. I barely drove it to my mechanic and he thought it was BCM and we replaced it but the problem is still there. I was told it might be the cylinder ignition switch or the cylinder lock whats the chance of it being either one of those? If you know its not one of those, what is it? PLEASE HELP!
Dec 25, 2011 at 7:16 PM
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D_PASOVIC1995
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AND THE CAR ALSO STOPPED GIVING POWER THE OTHER DAY, THE KEY WONT GO BACK ALL THE WAY SO IT LOSES POWER RIGHT AWAY
Dec 25, 2011 at 7:33 PM
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RIVERMIKERAT
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Check the fuel pressure while the problem is occurring. Also check to see if it's getting spark while the problem is occurring.
Dec 25, 2011 at 7:38 PM
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D_PASOVIC1995
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fuel pressure is fine
Dec 25, 2011 at 7:41 PM
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RIVERMIKERAT
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When the car is running fine or when the problem occurs? What about spark when the problem occurs? Also have it scanned for both soft and hard codes.
Dec 25, 2011 at 7:49 PM