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Hi, our x3 has thrown several codes: p0300, p0302,p0305, and p0306. I bought a scanner and reset the codes. They came back immediately. The car definitely misfires and bogs down at slow speeds. At higher speeds it seems to run OK but pulling a small hill or overpass (Houston is pretty flat), it will also slow down. The dealer said we needed to replace all the coils and plugs. The car has about 75k miles and I am not sure what was done to it previously (since we bought it used). Any suggestions would be most welcome. Thanks! Lee
 
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