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Rough idle and has a skip loss of power

Vehicle: 2001 Chevy Impala LS 3.8

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P0300 is a random misfire, where it is more than 1 cylinder that is not contributing , So as a 3.8 engine you have 6 cylinder and at least there is 2 cylinder that are not contributing, . What you are experiencing is exactly what a random misfire will do. This can be ignition wire to sparkplug related , to fuel pressure being to low in volume, to a mechanical condition.

Read more https://www.engine-codes.com/p0300.html

Read more https://www.engine-codes.com/p0102_chevrolet.html

Read more https://www.autocodes.com/p0135.html

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