Question about 1999 Pontiac Bonneville

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Killing problem on 1999 bonneville

Have a problem with my 1999 bonneville. once it warms up, it tends to want to kill upon stopping or making a turn. it will also give me an occasional **** motion while running steady, it will start right back up with no problem. i've change the fuel pump and filter and also the plugs. (i find that if i put it in nuetral as i'm coming to a stop it tends not to kill.)

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  • jostharris Dec 12, 2008

    The car starts promptly. While braking the vehicle cuts off intermittently. It will restart promptly and run again no problem. It is not consistent so it is difficult to diagnose.

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Well it seems to be an transmission problem. when you have it under load(in gear) there seems to be resistance that stalls the motor. the engine speed sensor sends a signal to the ecm(engine control module) this in turn sends a signal to the trans control module. from there the signal goes to a solenoid inside the trans the shifts the gears. somewhere in that circuit is the problem. you need to take it to a shop and have a scan done, this will isolate the problem. please rate this ..thanks

Posted on Sep 11, 2008

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