what would make a 2004 Buick lesabre idles smooth runs rough at 4000 rpm

Asked by Jan 10, 2015 at 06:46 PM about the 2004 Buick LeSabre Custom

Question type: General

startup and runs perfect until it is reved up to 4000 rpms and it won't go above 4000
above that

1 Answer

100

could be a faulty coil or ECM.. what does the car do at 4000? stall or change how ir runs all together? Any different noises than before?

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