1997 Buick LeSabre Logo
Posted on Jan 07, 2011
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My check engine light is flashing, the car runs rough until I get up to about 30mph and it is running through gas like crazy

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Illusive Man

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  • Posted on Jan 07, 2011
Illusive Man
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Joined: Jan 07, 2011
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Sounds like you have cylinder misfire. Any of the large auto parts stores can run an OBDII check and tell you which cylinder is misfiring (not firing). The engine is running with one cylinder out causing the rough idle. The faster the car goes the less perceptible the misfire is. That is why at 30mph the car seems to run smooth.

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