Impala While undergoing many facelifts in its history, the Impala has proved itself to both civilians and police forces as one of the most capable 4-door cars GM has ever offered. Currently moving towards its 10th generation the Impala is one of the longest lasting and popular models.

2014 Chevrolet Impala
Includes: Bel-air
Platform: B-body & W-body

misfire -knock

Old May 3, 2011 | 2:28 PM
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bridgeton's Avatar
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Default misfire -knock

2007 impala 3900 misfire code p300 scanned with multiple misfires also knock present -oilfull head gaskets already replaced anyone with similar problems?
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Old May 3, 2011 | 6:24 PM
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Welcome to the forum. Unfortunately P0300 is just a starting point. It's pretty meaningless without the accompanying freeze frame data. Take it in if you're still covered under the 5yr/100k powertrain warranty.
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